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Income Taxes - Balance Sheet Location for Deferred Items and Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets and liabilities      
Other long-term assets $ 79.1 $ 82.0  
Other long-term liabilities (231.1) (237.0)  
Net deferred tax liabilities (152.0) (155.0)  
Undistributed foreign earnings 11.0 7.9  
Reconciliation of the beginning and ending amount of unrecognized tax benefits      
Balance at the beginning of the period 37.4 24.6 $ 27.7
Additions based on tax positions related to current year 3.3 3.0 0.6
Additions related to acquired uncertain tax positions 0.0 12.6 0.0
Adjustments for tax positions of prior years 0.0 1.5 0.0
Reductions due to statute of limitations (12.0) (3.3) (2.1)
Reductions due to settlements (1.2) (1.7) (1.4)
Adjustments due to foreign exchange rates (0.2)   (0.2)
Adjustments due to foreign exchange rates   0.7  
Balance at the end of the period 27.3 37.4 24.6
Uncertain tax position that would impact effective tax rate 30.1    
Total amount of interest and penalties accrued $ 5.1 5.9 $ 4.7
Number of months within which state and foreign audits may conclude 12 months    
Minimum      
Reconciliation of the beginning and ending amount of unrecognized tax benefits      
Decrease in unrecognized tax benefits is reasonably possible $ 4.0    
Maximum      
Reconciliation of the beginning and ending amount of unrecognized tax benefits      
Decrease in unrecognized tax benefits is reasonably possible 5.0    
Other long-term assets      
Deferred tax assets and liabilities      
Other long-term assets 2.6 1.4  
Other long-term liabilities      
Deferred tax assets and liabilities      
Other long-term liabilities $ (154.6) $ (156.4)