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Share Based Compensation -Restricted Stock Units - Narrative (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation $ 3.9 $ 4.5 $ 13.8 $ 15.6
Restricted stock units
       
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation 2.7 3.6 10.5 12.8
Unrecognized share-based compensation cost 15.4   15.4  
Equity instruments other than options expected to vest, Shares 2.0   2.0  
Equity instruments other than options expected to vest, weighted-average grant date fair value $ 12.52   $ 12.52  
Unrecognized compensation expense, weighted-average period of recognition     2 years 3 months 18 days  
Excess tax benefits shown as financing cash inflows     $ 2.5 $ 2.2