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Shareholders' Equity and Long-Term Incentive Compensation - AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of accumulated other comprehensive income, net of tax [Roll Forward]      
Beginning Balance $ 414.9    
Other comprehensive income (loss) before reclassifications 1.3 $ (7.2)  
Amounts reclassified from accumulated other comprehensive income (loss) (1.9) (2.5)  
Current-period other comprehensive income (loss) (0.6) (5.2)  
Impact of initial adoption of ASC 606 - See Note 3   (0.3)  
Stranded income tax effects resulting from tax reform - See Note 3   4.8  
Ending Balance 502.4 414.9  
Accum. Other Comprehensive Income      
Components of accumulated other comprehensive income, net of tax [Roll Forward]      
Beginning Balance 244.9 250.1  
Ending Balance 244.3 244.9  
Foreign Currency Translation Adjustment      
Components of accumulated other comprehensive income, net of tax [Roll Forward]      
Beginning Balance 225.8 230.2  
Other comprehensive income (loss) before reclassifications 2.2 (4.4)  
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0  
Current-period other comprehensive income (loss) 2.2 (4.4)  
Impact of initial adoption of ASC 606 - See Note 3   0.0  
Stranded income tax effects resulting from tax reform - See Note 3   0.0  
Ending Balance 228.0 225.8  
Net Unrealized Losses on Qualifying Cash Flow Hedges      
Components of accumulated other comprehensive income, net of tax [Roll Forward]      
Beginning Balance (0.6)    
Other comprehensive income (loss) before reclassifications (2.1)    
Amounts reclassified from accumulated other comprehensive income (loss) 1.1    
Current-period other comprehensive income (loss) (1.0)    
Ending Balance (1.6) (0.6)  
Pension and postretirement liability adjustment and other, tax provision benefit (expense) 0.5    
Net Unrealized Gains (Losses) on Qualifying Cash Flow Hedges      
Components of accumulated other comprehensive income, net of tax [Roll Forward]      
Beginning Balance (0.6) 0.8  
Other comprehensive income (loss) before reclassifications   (1.8)  
Amounts reclassified from accumulated other comprehensive income (loss)   0.5  
Current-period other comprehensive income (loss)   (1.4)  
Impact of initial adoption of ASC 606 - See Note 3   (0.3)  
Stranded income tax effects resulting from tax reform - See Note 3   0.2  
Ending Balance   (0.6)  
Pension and postretirement liability adjustment and other, tax provision benefit (expense)   0.2 $ (0.5)
Pension and Postretirement Liability Adjustment and Other      
Components of accumulated other comprehensive income, net of tax [Roll Forward]      
Beginning Balance 19.7 19.1  
Other comprehensive income (loss) before reclassifications 1.2 (1.0)  
Amounts reclassified from accumulated other comprehensive income (loss) (3.0) (3.0)  
Current-period other comprehensive income (loss) (1.8) 0.6  
Impact of initial adoption of ASC 606 - See Note 3   0.0  
Stranded income tax effects resulting from tax reform - See Note 3   4.6  
Ending Balance 17.9 19.7  
Pension and postretirement liability adjustment and other, tax provision benefit (expense) $ (6.1) $ (6.6) $ (12.5)