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Income Taxes - Federal Statutory Corporate Tax Rate Reconciles to Our Effective Income Tax Rate (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Computed expected tax, amount $ 149.1 $ 93.5 $ 63.0
State income taxes, net of federal tax benefit, amount 5.2 (5.7) (2.2)
Foreign earnings taxed at lower rates, amount (21.8) (35.2) (15.9)
U.S. tax on foreign earnings, amount 12.1 10.5 8.6
Foreign tax credits, amount (54.4)    
Unremitted foreign earnings, amount (86.0) (5.2)  
Overall foreign loss recapture, amount 67.9    
Net change in valuation allowance, amount (58.2) (13.2) 40.3
Net change in unrecognized tax benefits, amount 56.8 (23.4) 3.6
Reorganization tax benefit, amount   (2.2) (12.0)
Other, amount 19.8 (10.0) (0.5)
Total income tax provision $ 90.5 $ 9.1 $ 84.9
Computed expected tax, percentage 35.00% 35.00% 35.00%
State income taxes, net of federal tax benefit, percentage 1.20% (2.10%) (1.20%)
Foreign earnings taxed at lower rates, percentage (5.10%) (13.20%) (8.80%)
U.S. tax on foreign earnings, percentage 2.80% 3.90% 4.80%
Foreign tax credits, percentage (12.80%)    
Unremitted foreign earnings, percentage (20.20%) (1.90%)  
Overall foreign loss recapture, percentage 16.00%    
Net change in valuation allowance, percentage (13.70%) (4.90%) 22.40%
Net change in unrecognized tax benefits, percentage 13.30% (8.80%) 2.00%
Reorganization tax benefit, percentage   (0.90%) (6.70%)
Other, percentage 4.70% (3.70%) (0.30%)
Effective income tax rate, percentage 21.20% 3.40% 47.10%