v3.7.0.1
Income Taxes - Balance Sheet Presentation of Net Deferred Tax Liability (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Assets:    
Deferred income taxes $ 7.4 $ 1.7
Liabilities:    
Deferred income taxes 223.7 231.3
Net deferred tax liability $ 216.3 $ 229.6