Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.3.0.814
Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Income taxes $ 43.9 $ (13.3) $ 114.8 $ 76.9
Effective income tax rate 31.90% 647.90% 31.10% 27.20%
Utilization of deferred tax asset interest expense $ (240.8)      
Total amount of unrecognized tax benefits, including related interest and penalties 57.7   $ 57.7  
Unrecognized tax benefits excluding interest and penalties that if recognized would affect the effective tax rate 45.5   45.5  
Total accrued interest for tax contingencies 7.0   7.0  
Total accrued penalties for tax contingencies 1.4   1.4  
Amount of unrecognized tax benefits that could decrease within the next 12 months 12.7   12.7  
Decrease in unrecognized tax benefits due to the settlement of audits or resolution of administrative or judicial proceedings 5.7   5.7  
Decrease in unrecognized tax benefits expiration of statute of limitations $ 7.0   $ 7.0