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
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]          
Unrealized gain on pension and postretirement benefit plans, net of tax     $ (1.2) $ 1.5  
Estimated future benefit payments     4.9    
Benefits expense $ 0.6 $ 1.0 3.0 2.5 $ 3.7
Defined Benefit Pension Plans          
Defined Benefit Plan Disclosure [Line Items]          
Benefit obligation     9.0 8.2  
Business expense $ 0.3 $ 0.3 1.1 1.3 $ 1.2
Other Postretirement Benefit Plans          
Defined Benefit Plan Disclosure [Line Items]          
Benefit obligation     $ 0.5 $ 0.5