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Income Taxes - Reconciliation of United States Federal Statutory Tax Rate to Effective Tax Rate on Income Before Provision for Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
U.S. statutory tax rate 21.00% 35.00% 35.00%
State and local taxes, net of federal tax benefit 2.20% 1.90% 2.20%
Benefit of foreign operations 1.80% (9.90%) (13.30%)
Settlement Charge     27.40%
Legacy tax items     (0.10%)
U.S. Tax Act impact (2.80%) 17.00%  
Other (1.20%) (0.40%) (0.60%)
Effective tax rate 21.00% 43.60% 50.60%
Income tax paid $ 442.1 $ 366.4 $ 355.7