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Shareholders' Equity and Long-Term Incentive Compensation - AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Components of accumulated other comprehensive income, net of tax [Roll Forward]      
Beginning Balance $ 502.4    
Other comprehensive income (loss) before reclassifications 4.9 $ 1.3  
Amounts reclassified from accumulated other comprehensive income (loss) (0.7) (1.9)  
Current-period other comprehensive income (loss) 4.2 (0.6)  
Ending Balance 629.2 502.4  
Accum. Other Comprehensive Income      
Components of accumulated other comprehensive income, net of tax [Roll Forward]      
Beginning Balance 244.3 244.9  
Ending Balance 248.5 244.3  
Foreign Currency Translation Adjustment      
Components of accumulated other comprehensive income, net of tax [Roll Forward]      
Beginning Balance 228.0 225.8  
Other comprehensive income (loss) before reclassifications 10.6 2.2  
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0  
Current-period other comprehensive income (loss) 10.6 2.2  
Ending Balance 238.6 228.0  
Net Unrealized Losses on Qualifying Cash Flow Hedges      
Components of accumulated other comprehensive income, net of tax [Roll Forward]      
Beginning Balance (1.6) (0.6)  
Other comprehensive income (loss) before reclassifications (5.7) (2.1)  
Amounts reclassified from accumulated other comprehensive income (loss) 2.9 1.1  
Current-period other comprehensive income (loss) (2.8) (1.0)  
Ending Balance (4.4) (1.6)  
Pension and postretirement liability adjustment and other, tax provision benefit (expense) 1.4 0.5 $ 0.2
Pension and Postretirement Liability Adjustment and Other      
Components of accumulated other comprehensive income, net of tax [Roll Forward]      
Beginning Balance 17.9 19.7  
Other comprehensive income (loss) before reclassifications 0.0 1.2  
Amounts reclassified from accumulated other comprehensive income (loss) (3.6) (3.0)  
Current-period other comprehensive income (loss) (3.6) (1.8)  
Ending Balance 14.3 17.9  
Pension and postretirement liability adjustment and other, tax provision benefit (expense) $ (4.9) $ (6.1) $ (6.6)