Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details)

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Employee Benefit Plans (Details) - USD ($)
$ in Millions
 2 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2021
Oct. 19, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]          
Amount recognized in accumulated other comprehensive loss $ 1.6   $ 2.2 $ 2.8  
Estimated future benefit payments 5.1        
Benefits expense 0.6 $ 1.0 3.7 3.1 $ 1.7
Defined Benefit Pension Plans          
Defined Benefit Plan Disclosure [Line Items]          
Business expense 0.3 $ 0.3 1.2 1.2 $ 1.1
Unfunded benefit plan | Defined Benefit Pension Plans          
Defined Benefit Plan Disclosure [Line Items]          
Benefit obligation 11.4   12.3 11.9  
Unfunded benefit plan | Other Postretirement Benefit Plans          
Defined Benefit Plan Disclosure [Line Items]          
Benefit obligation $ 0.6   $ 0.7 $ 0.7