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Revenue Recognition - Adoption Impact (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues $ 648.0 $ 722.1    
Royalty income, net of royalty expense 0.0 $ (4.8)    
Prepaid expenses and other current assets 71.2     $ 64.8
Deferred income taxes 25.1     23.6
Other non-current assets 235.5     227.4
Accrued expenses and other current liabilities 226.5     234.2
Other non-current liabilities 214.9     207.4
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 142.6     $ 112.5
Calculated under Revenue Guidance in Effect before Topic 606        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues 642.7      
Royalty income, net of royalty expense (5.3)      
Prepaid expenses and other current assets 69.9      
Deferred income taxes 24.1      
Other non-current assets 234.7      
Accrued expenses and other current liabilities 223.9      
Other non-current liabilities 212.0      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 145.0      
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues 5.3      
Royalty income, net of royalty expense 5.3      
Prepaid expenses and other current assets 1.3      
Deferred income taxes 1.0      
Other non-current assets 0.8      
Accrued expenses and other current liabilities 2.6      
Other non-current liabilities 2.9      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ (2.4)      
Retained Earnings | Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Reclassification and remeasurement of sales return asset under Topic 606     $ 3.0