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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]      
Provision for income taxes at United States federal statutory rate of 35% $ 97.8 $ 188.7 $ 280.9
State and local income taxes, net of federal income tax effects (2.0) 2.6 5.6
Taxes on foreign income which differ from the United States statutory rate (34.9) (33.4) (34.7)
Tax effect of permanent differences 7.1 (10.3) (7.6)
Change in valuation allowance (4.5) 22.8 9.3
Change in tax contingency reserves 15.4 25.2 25.7
Research and development tax credits (4.9) (7.1) (19.9)
Other (1.5) (0.8) (0.8)
Income tax provision $ 72.5 $ 187.7 $ 258.5