Business Combinations and Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details)

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Business Combinations and Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions					1 Months Ended	2 Months Ended	4 Months Ended	6 Months Ended	10 Months Ended	12 Months Ended
	Dec. 01, 2021	Oct. 20, 2021	Dec. 18, 2020	Sep. 01, 2020	Feb. 28, 2021	Dec. 31, 2021	Oct. 19, 2021	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Business Acquisition [Line Items]
Goodwill		$ 0.0				$ 1,662.6	$ 677.4	$ 681.5	$ 681.5	$ 1,418.0	$ 1,662.6	$ 681.5	$ 522.6
GAAP purchase consideration, net of cash acquired						$ 58.6	$ 0.9			$ 6.6		$ 290.1	$ 55.7
Cash consideration paid by GSAH		$ 1,300.0
Interest Rate Swap Cap Agreement
Business Acquisition [Line Items]
Other long-term liabilities	$ (9.0)
Customer relationships | Minimum
Business Acquisition [Line Items]
Original Average Life in Years		6 years	10 years	10 years						6 years	6 years	6 years
Customer relationships | Maximum
Business Acquisition [Line Items]
Original Average Life in Years		13 years	11 years	11 years						13 years	13 years	17 years
Developed technology | Minimum
Business Acquisition [Line Items]
Original Average Life in Years		5 years	7 years	7 years						5 years	5 years	3 years
Developed technology | Maximum
Business Acquisition [Line Items]
Original Average Life in Years		16 years	10 years	10 years						16 years	16 years	16 years
Trade names
Business Acquisition [Line Items]
Original Average Life in Years		10 years	7 years	7 years
Trade names | Minimum
Business Acquisition [Line Items]
Original Average Life in Years										3 years	3 years	5 years
Trade names | Maximum
Business Acquisition [Line Items]
Original Average Life in Years										10 years	10 years	9 years
Distributor relationships | Minimum
Business Acquisition [Line Items]
Original Average Life in Years		7 years								7 years	7 years
Distributor relationships | Maximum
Business Acquisition [Line Items]
Original Average Life in Years		13 years								13 years	13 years
Backlog and other | Minimum
Business Acquisition [Line Items]
Original Average Life in Years		1 year								1 year	1 year	1 year
Backlog and other | Maximum
Business Acquisition [Line Items]
Original Average Life in Years		4 years								4 years	4 years	9 years
Noncompete Agreements
Business Acquisition [Line Items]
Original Average Life in Years		1 year
Noncompete Agreements | Minimum
Business Acquisition [Line Items]
Original Average Life in Years			2 years	2 years
Noncompete Agreements | Maximum
Business Acquisition [Line Items]
Original Average Life in Years			3 years	3 years
Mirion
Business Acquisition [Line Items]
Goodwill		$ 1,642.9
Total amortizable intangible assets		821.0
Cash		101.9
Accounts receivable		114.3
Cost in excess of billings		63.3
Inventory		144.6
Property, Plant and Equipment		126.4
Other current and non-current assets		24.4
Right of use assets		43.3
Other non-current assets		10.8
Current liabilities		(148.2)
Current lease liability		(8.8)
Deferred contract revenue		(58.9)
Notes payable assumed		(3.0)
Other long-term liabilities		(241.4)
Minority interest		(0.3)
Net tangible assets acquired		168.4
Total consideration transferred		2,632.3
Less: cash acquired		(101.9)
GAAP purchase consideration, net of cash acquired		2,530.4
Mirion | Customer relationships
Business Acquisition [Line Items]
Total amortizable intangible assets		338.8
Mirion | Developed technology
Business Acquisition [Line Items]
Total amortizable intangible assets		234.6
Mirion | Trade names
Business Acquisition [Line Items]
Total amortizable intangible assets		100.5
Mirion | Distributor relationships
Business Acquisition [Line Items]
Total amortizable intangible assets		61.1
Mirion | Backlog and other
Business Acquisition [Line Items]
Total amortizable intangible assets		81.5
Mirion | Noncompete Agreements
Business Acquisition [Line Items]
Total amortizable intangible assets		4.5
Mirion | Medical
Business Acquisition [Line Items]
Goodwill		680.4
Total amortizable intangible assets		330.5
Cash		7.8
Accounts receivable		44.0
Cost in excess of billings		0.0
Inventory		25.1
Property, Plant and Equipment		52.6
Other current and non-current assets		5.8
Right of use assets		22.3
Other non-current assets		8.0
Current liabilities		(31.8)
Current lease liability		(4.1)
Deferred contract revenue		(34.7)
Notes payable assumed		(1.8)
Other long-term liabilities		(70.0)
Minority interest		0.0
Net tangible assets acquired		23.2
Mirion | Medical | Customer relationships
Business Acquisition [Line Items]
Total amortizable intangible assets		152.7
Mirion | Medical | Developed technology
Business Acquisition [Line Items]
Total amortizable intangible assets		66.3
Mirion | Medical | Trade names
Business Acquisition [Line Items]
Total amortizable intangible assets		36.8
Mirion | Medical | Distributor relationships
Business Acquisition [Line Items]
Total amortizable intangible assets		52.5
Mirion | Medical | Backlog and other
Business Acquisition [Line Items]
Total amortizable intangible assets		17.7
Mirion | Medical | Noncompete Agreements
Business Acquisition [Line Items]
Total amortizable intangible assets		4.5
Mirion | Industrial
Business Acquisition [Line Items]
Goodwill		962.5
Total amortizable intangible assets		490.5
Cash		39.5
Accounts receivable		70.3
Cost in excess of billings		63.3
Inventory		119.5
Property, Plant and Equipment		72.7
Other current and non-current assets		13.3
Right of use assets		20.1
Other non-current assets		2.8
Current liabilities		(82.7)
Current lease liability		(4.4)
Deferred contract revenue		(24.2)
Notes payable assumed		(1.2)
Other long-term liabilities		(147.6)
Minority interest		(0.2)
Net tangible assets acquired		141.2
Mirion | Industrial | Customer relationships
Business Acquisition [Line Items]
Total amortizable intangible assets		186.1
Mirion | Industrial | Developed technology
Business Acquisition [Line Items]
Total amortizable intangible assets		168.3
Mirion | Industrial | Trade names
Business Acquisition [Line Items]
Total amortizable intangible assets		63.7
Mirion | Industrial | Distributor relationships
Business Acquisition [Line Items]
Total amortizable intangible assets		8.6
Mirion | Industrial | Backlog and other
Business Acquisition [Line Items]
Total amortizable intangible assets		63.8
Mirion | Industrial | Noncompete Agreements
Business Acquisition [Line Items]
Total amortizable intangible assets		0.0
Mirion | Corporate
Business Acquisition [Line Items]
Goodwill		0.0
Total amortizable intangible assets		0.0
Cash		54.6
Accounts receivable		0.0
Cost in excess of billings		0.0
Inventory		0.0
Property, Plant and Equipment		1.1
Other current and non-current assets		5.3
Right of use assets		0.9
Other non-current assets		0.0
Current liabilities		(33.7)
Current lease liability		(0.3)
Deferred contract revenue		0.0
Notes payable assumed		0.0
Other long-term liabilities		(23.8)
Minority interest		(0.1)
Net tangible assets acquired		4.0
Mirion | Corporate | Customer relationships
Business Acquisition [Line Items]
Total amortizable intangible assets		0.0
Mirion | Corporate | Developed technology
Business Acquisition [Line Items]
Total amortizable intangible assets		0.0
Mirion | Corporate | Trade names
Business Acquisition [Line Items]
Total amortizable intangible assets		0.0
Mirion | Corporate | Distributor relationships
Business Acquisition [Line Items]
Total amortizable intangible assets		0.0
Mirion | Corporate | Backlog and other
Business Acquisition [Line Items]
Total amortizable intangible assets		0.0
Mirion | Corporate | Noncompete Agreements
Business Acquisition [Line Items]
Total amortizable intangible assets		$ 0.0
CIRS | Customer relationships
Business Acquisition [Line Items]
Original Average Life in Years	7 years
CIRS | Developed technology
Business Acquisition [Line Items]
Original Average Life in Years	5 years
CIRS | Trade names
Business Acquisition [Line Items]
Original Average Life in Years	3 years
CIRS | Backlog and other
Business Acquisition [Line Items]
Original Average Life in Years	2 years
CIRS | Medical
Business Acquisition [Line Items]
Goodwill	$ 34.0
Total amortizable intangible assets	21.8
Cash	1.0
Accounts receivable	1.6
Inventory	2.0
Property, Plant and Equipment	0.4
Current lease liability	(0.5)
Net tangible assets acquired	(1.7)
Total consideration transferred	55.1
Less: cash acquired	(1.0)
GAAP purchase consideration, net of cash acquired	54.1
Acquiree revenue post acquisition through the period ended December 31, 2021	1.5
Acquiree income (loss) from operations post acquisition through the period ended December 31, 2021	(0.1)
Operating ROU assets	3.8
CIRS | Medical | Customer relationships
Business Acquisition [Line Items]
Total amortizable intangible assets	1.6
CIRS | Medical | Developed technology
Business Acquisition [Line Items]
Total amortizable intangible assets	19.2
CIRS | Medical | Trade names
Business Acquisition [Line Items]
Total amortizable intangible assets	0.4
CIRS | Medical | Backlog and other
Business Acquisition [Line Items]
Total amortizable intangible assets	$ 0.6
Biodex | Medical
Business Acquisition [Line Items]
Goodwill				$ 11.1
Total amortizable intangible assets				6.6
Cash				4.1
Accounts receivable				4.0
Inventory				6.4
Property, Plant and Equipment				1.0
Other current and non-current assets				0.6
Current liabilities				(2.6)
Deferred contract revenue				(0.2)
Other long-term liabilities				0.0
Net tangible assets acquired				13.3
Total consideration transferred									31.0
Less: cash acquired									(4.1)
GAAP purchase consideration, net of cash acquired									26.9
Acquiree revenue post acquisition through the period ended December 31, 2021									32.6
Acquiree income (loss) from operations post acquisition through the period ended December 31, 2021									$ 0.7
Biodex | Medical | Customer relationships
Business Acquisition [Line Items]
Total amortizable intangible assets				2.3
Biodex | Medical | Developed technology
Business Acquisition [Line Items]
Total amortizable intangible assets				2.6
Biodex | Medical | Trade names
Business Acquisition [Line Items]
Total amortizable intangible assets				1.4
Biodex | Medical | Noncompete Agreements
Business Acquisition [Line Items]
Total amortizable intangible assets				$ 0.3
Sun Nuclear | Medical
Business Acquisition [Line Items]
Goodwill			$ 130.2
Total amortizable intangible assets			125.5
Cash			18.8
Accounts receivable			24.0
Inventory			13.9
Property, Plant and Equipment			5.9
Other current and non-current assets			8.0
Current liabilities			(9.3)
Deferred contract revenue			(6.5)
Other long-term liabilities			(33.6)
Net tangible assets acquired			21.2
Total consideration transferred								276.9
Less: cash acquired								(18.8)
GAAP purchase consideration, net of cash acquired								258.1
Acquiree revenue post acquisition through the period ended December 31, 2021								48.9
Acquiree income (loss) from operations post acquisition through the period ended December 31, 2021								$ (5.5)
Cash consideration paid by GSAH					$ 261.9
Business combination, deferred consideration					$ 15.0
Sun Nuclear | Medical | Customer relationships
Business Acquisition [Line Items]
Total amortizable intangible assets			59.5
Sun Nuclear | Medical | Developed technology
Business Acquisition [Line Items]
Total amortizable intangible assets			46.5
Sun Nuclear | Medical | Trade names
Business Acquisition [Line Items]
Total amortizable intangible assets			12.0
Sun Nuclear | Medical | Noncompete Agreements
Business Acquisition [Line Items]
Total amortizable intangible assets			$ 7.5