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Revenue Recognition (Schedule of Effects of Adjustments) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Prepaid expenses and other current assets $ 47.8 $ 47.4 $ 45.1  
Other long-term assets 93.9 121.3 119.3 $ 84.3
Deferred income taxes 32.1 43.0 41.9  
Accumulated deficit $ (211.4) (159.7) (162.9)  
Calculated under Revenue Guidance in Effect before Topic 606        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Prepaid expenses and other current assets     45.1  
Other long-term assets     119.3  
Deferred income taxes     41.9  
Accumulated deficit     $ (162.9)  
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Prepaid expenses and other current assets   2.3    
Other long-term assets   2.0    
Deferred income taxes   1.1    
Accumulated deficit   $ 3.2