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Share-Based Compensation - Restricted Stock Units - Narrative (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation $ 3.5 $ 3.5
Restricted stock units    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation 2.3 2.6
Unrecognized share-based compensation cost $ 26.2  
Equity instruments other than options expected to vest, Shares 2.3  
Equity instruments other than options expected to vest, weighted-average grant date fair value $ 13.83  
Unrecognized compensation expense, weighted-average period of recognition 2 years 6 months  
Excess tax benefits shown as financing cash inflows $ 0.9 $ 2.1