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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 660.0 $ 735.9 $ 588.8
Other comprehensive income (loss):      
Change in foreign currency translation gains (losses) 3.6 2.0 (1.2)
Available-for-sale investments:      
Change in unrealized losses, net of tax (2.7) (4.6) (3.2)
Less: Reclassification adjustment for net gains (losses) on investments recognized during the year, net of tax 0.0 0.2 (0.8)
Net change, net of tax effect (2.7) (4.4) (4.0)
Derivative instruments:      
Change in unrealized gains (losses) (8.6) 4.1 7.8
Less: Reclassification adjustment for gains (losses) on derivative instruments recognized during the year, net of tax 1.2 (0.6) (7.4)
Net change, net of tax effect (7.4) 3.5 0.4
Employee benefit plans:      
Change in unrealized losses, net of tax (0.3) (0.7) (0.4)
Less: Reclassification adjustment for gains on employee benefit plans recognized during the year, net of tax 0.2 0.2 0.8
Net change, net of tax effect (0.1) (0.5) 0.4
Other comprehensive gains (losses) (6.6) 0.6 (4.4)
Total comprehensive income $ 653.4 $ 736.5 $ 584.4