Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation between Provision for Income Taxes at Statutory Rate and Provision for Income Taxes at Effective Tax Rate (Detail)

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Income Taxes - Reconciliation between Provision for Income Taxes at Statutory Rate and Provision for Income Taxes at Effective Tax Rate (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Tax expense at United States statutory rate $ 170.2 $ 147.4 $ 250.9
Increase (decrease) in tax resulting from:      
Differences between U.S. and foreign tax rates on foreign income, including withholding taxes 203.1 (60.0) (82.1)
U.S. tax (benefit) on foreign income net of foreign tax credits (23.9) (73.4) (4.7)
(Decrease) increase in valuation allowances (205.6) 85.7 36.7
State taxes, net of federal benefit 1.7 4.1 5.7
Unrecognized tax benefits 10.1 13.0 (10.3)
Other (8.3) (4.2) (7.0)
Total $ 147.3 $ 112.6 $ 189.2