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Stockholders' Equity - Total Share-based Compensation Expense (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Total share-based incentive compensation expense $ 5.4 $ 6.6 $ 20.3 $ 16.9