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Revenue Recognition and Contracts with Customers (Contract with Customer Asset and Liability) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]          
Billed accounts receivable $ 2.5 $ 2.5   $ 60.2  
Billed accounts receivable – increase (decrease)   (57.7)      
Unbilled contract revenue 0.0 0.0   0.1  
Unbilled receivables – increase (decrease)   (0.1)      
Accounts receivable, net 2.5 2.5   60.3 $ 60.2
Accounts receivable – increase (decrease) (57.6) (57.8) $ (14.5)    
Deferred costs associated with deferred revenue 122.7 122.7   122.3 122.3
Deferred costs – increase (decrease)   0.4      
Deferred revenue 175.6 175.6   172.5  
Deferred revenue – increase (decrease)   3.1      
Advances from customers 0.0 0.0   19.3  
Customer advances – increase (decrease)   (19.3)      
Deferred revenue and advances from customers 175.6 175.6   $ 191.8 191.8
Deferred revenue and customer advances – increase (decrease)   (16.2)      
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 (10.2)        
Deferred revenue, additions 23.3        
Deferred revenue, revenue recognized $ (20.2)