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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets and liabilities      
Other long-term assets $ 1.1 $ 0.3  
Other long-term liabilities (115.0) (144.0)  
Net deferred tax liabilities (113.9) (143.7)  
Un-repatriated earnings      
Cumulative unremitted earnings and translation adjustments 515.0    
Reconciliation of the beginning and ending amount of unrecognized tax benefits      
Balance at the beginning of the period 27.7 23.8 $ 10.2
Additions based on tax positions related to current year 0.6 0.9 1.8
Additions related to purchase accounting   3.0 13.6
Adjustments for tax positions of prior years   1.3 (0.1)
Reductions due to statute of limitations (2.1) (1.2) (1.2)
Reductions due to settlements (1.4)   (0.4)
Adjustments due to foreign exchange rates (0.2) (0.1) (0.1)
Balance at the end of the period 24.6 27.7 23.8
Uncertain tax position that would impact effective tax rate 26.0    
Total amount of interest and penalties accrued $ 4.7 $ 4.9 $ 3.8
Number of months within which state and foreign audits may conclude 12 months