XML 85 R66.htm IDEA: XBRL DOCUMENT v3.3.1.900
Income Taxes - Classification of Net Deferred Income Tax Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Long-term deferred income tax assets $ 646.0 $ 804.2
Long-term deferred income tax liabilities (45.6) (53.8)
Net deferred income tax asset $ 600.4 $ 750.4