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Revenue Recognition and Contracts with Customers (Contract with Customer Asset and Liability) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]          
Billed accounts receivable $ 27.9 $ 27.9   $ 60.2  
Billed accounts receivable – increase (decrease) (32.3)        
Unbilled contract revenue       0.1  
Unbilled receivables – increase (decrease) (0.1)        
Accounts receivable, net 27.9 27.9   60.3 $ 60.2
Accounts receivable – increase (decrease) (32.4) (32.1) $ 32.1    
Deferred costs associated with deferred revenue 130.2 130.2   122.3 122.3
Deferred costs – increase (decrease) 7.9        
Deferred revenue 193.1 193.1   172.5  
Deferred revenue – increase (decrease) 20.6        
Advances from customers 1.9 1.9   19.3  
Customer advances – increase (decrease) (17.4)        
Deferred revenue and advances from customers 195.0 195.0   $ 191.8 191.8
Deferred revenue and customer advances – increase (decrease) 3.2        
Advances from customers, noncurrent 14.5 14.5     $ 0.0
Advances from customers, noncurrent - increase (decrease) $ 14.5        
Deferred costs, additions   10.6      
Deferred costs, costs recognized   (2.7)      
Deferred revenue, additions   23.3      
Deferred revenue, revenue recognized   $ (2.7)