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Shareholders' Equity and Long-Term Incentive Compensation - AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of accumulated other comprehensive income, net of tax [Roll Forward]        
Beginning Balance   $ 314.7    
Other comprehensive income (loss), net   (5.2) $ 15.0 $ (48.2)
Ending Balance   414.9 314.7  
Accum. Other Comprehensive Income        
Components of accumulated other comprehensive income, net of tax [Roll Forward]        
Beginning Balance   250.1 235.1  
Other comprehensive income before reclassifications   (7.2) 19.1  
Reclassification from Accumulated Other Comprehensive Income, Initial Adoption of 606   (0.3)    
Reclassification from Accumulated Other Comprehensive Income, Stranded Tax Effects Resulting from the Tax Cuts and Jobs Act   4.8    
Amounts reclassified from accumulated other comprehensive income   (2.5) (4.1)  
Other comprehensive income (loss), net   (5.2) 15.0 (48.2)
Ending Balance   244.9 250.1 235.1
Foreign Currency Translation Adjustment        
Components of accumulated other comprehensive income, net of tax [Roll Forward]        
Beginning Balance   230.2 229.7  
Other comprehensive income before reclassifications   (4.4) 0.5  
Amounts reclassified from accumulated other comprehensive income     0.0  
Other comprehensive income (loss), net     0.5  
Ending Balance   225.8 230.2 229.7
Net Unrealized Losses on Qualifying Cash Flow Hedges        
Components of accumulated other comprehensive income, net of tax [Roll Forward]        
Beginning Balance   0.8 1.5  
Other comprehensive income before reclassifications   (1.8) 2.3  
Reclassification from Accumulated Other Comprehensive Income, Initial Adoption of 606   (0.3)    
Reclassification from Accumulated Other Comprehensive Income, Stranded Tax Effects Resulting from the Tax Cuts and Jobs Act   0.2    
Amounts reclassified from accumulated other comprehensive income   0.5 (3.0)  
Other comprehensive income (loss), net     (0.7)  
Ending Balance   (0.6) 0.8 1.5
Pension and postretirement liability adjustment and other, tax provision benefit (expense)   0.2 (0.5) (0.9)
Pension and Postretirement Liability Adjustment and Other        
Components of accumulated other comprehensive income, net of tax [Roll Forward]        
Beginning Balance   19.1 3.9  
Other comprehensive income before reclassifications   (1.0) 16.3  
Reclassification from Accumulated Other Comprehensive Income, Initial Adoption of 606   0.0    
Reclassification from Accumulated Other Comprehensive Income, Stranded Tax Effects Resulting from the Tax Cuts and Jobs Act   4.6    
Amounts reclassified from accumulated other comprehensive income   (3.0) (1.1)  
Other comprehensive income (loss), net     15.2  
Ending Balance   19.7 19.1 3.9
Pension and postretirement liability adjustment and other, tax provision benefit (expense)   (6.6) $ (12.5) $ (2.7)
U.S. Postretirement Plan (“OPEB”)        
Components of accumulated other comprehensive income, net of tax [Roll Forward]        
Plan amendment $ 26.8      
Other Expense        
Components of accumulated other comprehensive income, net of tax [Roll Forward]        
Other expense, net   $ 2.7