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Revenue Recognition - Adoption Impact (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues $ 729.5 $ 711.5 $ 2,026.8 $ 2,069.2    
Royalty income, net of royalty expense 0.0 $ (5.3) 0.0 $ (15.0)    
Prepaid expenses and other current assets 243.3   243.3     $ 63.4
Deferred income taxes 22.8   22.8     23.4
Other non-current assets 102.3   102.3     227.3
Accrued expenses and other current liabilities 376.0   376.0     222.3
Other non-current liabilities 126.7   126.7     206.1
Total Stockholders' Equity 209.5   209.5     $ 112.5
Calculated under Revenue Guidance in Effect before Topic 606            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues 724.0   2,010.5      
Royalty income, net of royalty expense 5.5   16.3      
Prepaid expenses and other current assets 242.0   242.0      
Deferred income taxes 21.9   21.9      
Other non-current assets 101.4   101.4      
Accrued expenses and other current liabilities 373.4   373.4      
Other non-current liabilities 123.8   123.8      
Total Stockholders' Equity 211.9   211.9      
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   16.3      
Royalty income, net of royalty expense (5.5)   (16.3)      
Prepaid expenses and other current assets 1.3   1.3      
Deferred income taxes 0.9   0.9      
Other non-current assets 0.9   0.9      
Accrued expenses and other current liabilities 2.6   2.6      
Other non-current liabilities 2.9   2.9      
Total Stockholders' Equity $ (2.4)   $ (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