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Classification of Net Deferred Tax Assets in Balance Sheet (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Contingency [Line Items]      
Total current assets $ 315.1 $ 270.7  
Deferred tax assets 20.1 45.1  
Total assets $ 666.5 658.7 $ 644.8
Impact of Adoption      
Income Tax Contingency [Line Items]      
Deferred tax assets (current)   $ (18.8)