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Pension and Other Post-retirement Benefits Net Periodic Pension Costs and Weighted Average Assumptions (Details) - USD ($)
$ in Millions
 4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2021
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]          
Interest cost   $ 6.6 $ 15.6 $ 31.2 $ 22.4
Expected return on plan assets   (12.1) (24.7) (31.4) (38.3)
Settlement (gain) loss recognized (1)   0.0 0.4 0.0 (0.4)
Amortization of net (gain) loss   0.1 0.0 (0.7) (0.1)
Net periodic pension costs   $ (5.4) $ (8.7) $ (0.9) $ (16.4)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 6.03% 6.03% 6.03% 7.10% 6.26%
Cash balance interest credit rate   2.94% 2.94% 3.23% 3.05%
Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Interest cost       $ 30.6 $ 22.0
Discount rate   2.30% 2.84% 5.21% 2.73%