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Classification of Net Deferred Tax Assets in Balance Sheet (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]      
Total current assets $ 259.6 $ 315.1  
Deferred tax assets 8.2 20.1  
Total assets $ 643.2 $ 666.5 $ 658.7