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Pension and Other Post-retirement Benefits Changes in Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Projected benefit obligation:        
BALANCE at the beginning of the period     $ 623.1 $ 843.5
Interest cost $ 6.6 $ 15.6 31.2 22.4
Actuarial loss (gain)     5.7 (194.8)
Plan settlements     0.0 (1.4)
Benefits paid     (42.5) (46.6)
BALANCE at the end of the period   843.5 617.5 623.1
Plan assets        
Fair value, at the beginning of the period     458.5 634.6
Actual return     48.5 (132.2)
Employer contributions     5.9 3.5
Foreign currency adjustments     41.7 46.0
Fair value, at the end of the period   634.6 471.2 458.5
Accumulated contributions less than net periodic benefit cost     (171.8) (179.3)
Amounts recognized in Consolidated Balance Sheet:        
Accrued liabilities     (4.7) (4.8)
Other liabilities (long-term)     (141.6) (159.8)
Net benefit liabilities     (146.3) (164.6)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]        
Actuarial loss     25.7 14.9
Prior service cost     (0.2) (0.2)
Total accumulated other comprehensive income     $ 25.5 $ 14.7
Weighted-average assumptions:        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.81%      
Cash balance interest credit rate     3.26% 3.23%
Pension Plan [Member]        
Projected benefit obligation:        
BALANCE at the beginning of the period     $ 611.5 $ 827.9
Interest cost     30.6 22.0
Actuarial loss (gain)     6.1 (191.0)
Plan settlements     0.0 (1.4)
Benefits paid     (41.7) (46.0)
BALANCE at the end of the period   827.9 606.5 611.5
Plan assets        
Fair value, at the beginning of the period     458.5 634.6
Actual return     48.5 (132.2)
Employer contributions     5.9 3.5
Foreign currency adjustments     41.7 46.0
Fair value, at the end of the period   634.6 471.2 458.5
Accumulated contributions less than net periodic benefit cost     (152.9) (159.8)
Amounts recognized in Consolidated Balance Sheet:        
Accrued liabilities     (3.6) (3.7)
Other liabilities (long-term)     (131.7) (149.3)
Net benefit liabilities     (135.3) (153.0)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]        
Actuarial loss     17.8 7.0
Prior service cost     (0.2) (0.2)
Total accumulated other comprehensive income     $ 17.6 $ 6.8
Weighted-average assumptions:        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate     4.97% 5.21%
Other Postretirement Benefits Plans And Supplemental Employee Retirement Plans [Member]        
Projected benefit obligation:        
BALANCE at the beginning of the period     $ 11.6 $ 15.6
Interest cost     0.6 0.4
Actuarial loss (gain)     (0.4) (3.8)
Plan settlements     0.0 0.0
Benefits paid     (0.8) (0.6)
BALANCE at the end of the period   15.6 11.0 11.6
Plan assets        
Fair value, at the beginning of the period     0.0 0.0
Actual return     0.0 0.0
Employer contributions     0.0 0.0
Foreign currency adjustments     0.0 0.0
Fair value, at the end of the period   $ 0.0 0.0 0.0
Accumulated contributions less than net periodic benefit cost     (18.9) (19.5)
Amounts recognized in Consolidated Balance Sheet:        
Accrued liabilities     (1.1) (1.1)
Other liabilities (long-term)     (9.9) (10.5)
Net benefit liabilities     (11.0) (11.6)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]        
Actuarial loss     7.9 7.9
Prior service cost     0.0 0.0
Total accumulated other comprehensive income     $ 7.9 $ 7.9
Weighted-average assumptions:        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate     5.00% 5.30%