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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Beginning balance $ 1,573.2 $ 1,396.3 $ 1,279.9
Other comprehensive income (loss) before reclassifications 40.6 8.4  
Amounts reclassified out (1.6) (3.8)  
Other comprehensive income (loss), net of tax 39.0 4.6 (36.9)
Ending balance 1,854.5 1,573.2 1,396.3
(Losses) gains on derivatives      
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Beginning balance (0.8) (0.4)  
Other comprehensive income (loss) before reclassifications 2.8 5.4  
Amounts reclassified out (3.9) (5.8)  
Other comprehensive income (loss), net of tax (1.1) (0.4)  
Ending balance (1.9) (0.8) (0.4)
Change in equity affiliate investment AOCI      
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Beginning balance 0.4 0.4  
Other comprehensive income (loss) before reclassifications 0.2 0.0  
Amounts reclassified out 0.0 0.0  
Other comprehensive income (loss), net of tax 0.2 0.0  
Ending balance 0.6 0.4 0.4
Defined benefit pension and other postretirement plans      
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Beginning balance (40.3) (40.4)  
Other comprehensive income (loss) before reclassifications (2.5) (1.9)  
Amounts reclassified out 2.3 2.0  
Other comprehensive income (loss), net of tax (0.2) 0.1  
Ending balance (40.5) (40.3) (40.4)
Foreign currency translation      
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Beginning balance (108.9) (113.8)  
Other comprehensive income (loss) before reclassifications 40.1 4.9  
Amounts reclassified out 0.0 0.0  
Other comprehensive income (loss), net of tax 40.1 4.9  
Ending balance (68.8) (108.9) (113.8)
Total      
Changes in the Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Beginning balance (149.6) (154.2) (117.3)
Ending balance $ (110.6) $ (149.6) $ (154.2)