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Basis of Presentation (Impact of ASC 606) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
ASSETS:      
Unbilled receivables $ 157.6 $ 146.4 $ 143.6
Other current assets 84.1 72.5 73.5
Other assets 92.2 91.5 88.3
LIABILITIES:      
Deferred revenue 584.7 552.9 566.4
Deferred taxes 829.8 834.2 829.6
Other liabilities 220.6 238.8 239.2
STOCKHOLDERS' EQUITY:      
Retained earnings $ 5,647.6 5,478.9 5,464.6
Calculated under Revenue Guidance in Effect before Topic 606      
ASSETS:      
Unbilled receivables     143.6
Other current assets     73.5
Other assets     88.3
LIABILITIES:      
Deferred revenue     566.4
Deferred taxes     829.6
Other liabilities     239.2
STOCKHOLDERS' EQUITY:      
Retained earnings     $ 5,464.6
Impact of ASC 606 Adoption | Accounting Standards Update 2014-09      
ASSETS:      
Unbilled receivables   2.8  
Other current assets   (1.0)  
Other assets   3.2  
LIABILITIES:      
Deferred revenue   (13.5)  
Deferred taxes   4.6  
Other liabilities   (0.4)  
STOCKHOLDERS' EQUITY:      
Retained earnings   $ 14.3