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Summary of Significant Accounting Policies - Changes in the Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Pre-tax $ 135.0 $ 37.5 $ (3.0)
Tax (0.5) (13.9) (4.1)
Other comprehensive income (loss) 134.5 23.6 (7.1)
Pension and OPEB liability adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Pre-tax (11.2) 9.9 8.9
Tax 1.8 (6.4) (2.8)
Other comprehensive income (loss) (9.4) 3.5 6.1
Derivative instrument adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Pre-tax (16.6) 61.3 11.9
Tax 0.1 (15.0) (0.7)
Other comprehensive income (loss) (16.5) 46.3 11.2
Foreign currency translation adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Pre-tax 35.4 (33.7) (23.8)
Tax 0.1 7.5 (0.6)
Other comprehensive income (loss) 35.5 (26.2) (24.4)
Reclassification of foreign currency translation to income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Pre-tax 127.4 0.0 0.0
Tax (2.5) 0.0 0.0
Other comprehensive income (loss) $ 124.9 $ 0.0 $ 0.0