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Equity - Restricted Stock Units Narrative (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 4.3 $ 4.2 $ 9.6 $ 8.6
Total unrecognized compensation expense 50.3   $ 50.3  
Performance based stock options [Member] | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted during the period     635,781  
Other than options - granted in period, weighted average fair value     $ 32.55  
Other than options - grant date fair value     $ 20.7  
Stock-based compensation expense 2.3 2.9 4.6 5.7
Total unrecognized compensation expense 27.3   $ 27.3  
Total unrecognized compensation expense weighted-average period     1 year 6 months  
Restricted Stock Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted during the period     114,287  
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 2.0 $ 1.3 $ 5.0 $ 2.9
Total unrecognized compensation expense $ 23.0   $ 23.0  
Total unrecognized compensation expense weighted-average period     1 year 5 months