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Information of UTPs Affecting Effective Tax Rate, if Recognized (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Beginning Balance $ 2.2 $ 2.5 $ 2.6
Current year additions 0.1 1.8  
Current year reduction due to lapse of applicable statute of limitations   (2.1) (0.1)
Current year reduction due to audit settlement 0.0    
Ending Balance $ 2.3 $ 2.2 $ 2.5