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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]      
Provision for income taxes at United States federal statutory rate of 35% $ 71.7 $ 97.8 $ 188.7
State and local income taxes, net of federal income tax effects (6.0) (2.0) 2.6
Taxes on foreign income which differ from the United States statutory rate (44.5) (34.9) (33.4)
Tax effect of permanent differences 14.4 7.1 (10.3)
Change in valuation allowance 37.9 (4.5) 22.8
Change in tax contingency reserves 23.4 15.4 25.2
Research and development tax credits (3.8) (4.9) (7.1)
Other (0.9) (1.5) (0.8)
Income tax provision $ 92.2 $ 72.5 $ 187.7