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Revenue Recognition - Adoption Impact (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues $ 669.7 $ 659.3 $ 1,317.7 $ 1,381.4    
Royalty income, net of royalty expense 0.0 $ (4.9) 0.0 $ (9.7)    
Prepaid expenses and other current assets 69.8   69.8     $ 64.8
Deferred income taxes 23.6   23.6     23.6
Other non-current assets 236.2   236.2     227.4
Accrued expenses and other current liabilities 227.2   227.2     234.2
Other non-current liabilities 209.0   209.0     207.4
Total Stockholders' Equity 158.0   158.0     $ 112.5
Calculated under Revenue Guidance in Effect before Topic 606            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues 664.2   1,306.9      
Royalty income, net of royalty expense (5.5)   (10.8)      
Prepaid expenses and other current assets 68.6   68.6      
Deferred income taxes 22.7   22.7      
Other non-current assets 235.3   235.3      
Accrued expenses and other current liabilities 224.7   224.7      
Other non-current liabilities 206.2   206.2      
Total Stockholders' Equity 160.3   160.3      
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 5.5   10.8      
Royalty income, net of royalty expense 5.5   10.8      
Prepaid expenses and other current assets 1.2   1.2      
Deferred income taxes 0.9   0.9      
Other non-current assets 0.9   0.9      
Accrued expenses and other current liabilities 2.5   2.5      
Other non-current liabilities 2.8   2.8      
Total Stockholders' Equity $ (2.3)   $ (2.3)      
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