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Share-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation (income) expense $ 3.8 $ 6.1 $ 18.6 $ 22.5
Stock options granted     1,221,000 200,000
Weighted average fair market value of options granted     $ 2.96 $ 4.39
Intrinsic value of options exercised 0 0.1 1.2 1.0
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation (income) expense 0.6 0.6 2.4 2.0
Unrecognized share-based compensation cost 3.9   3.9  
Options that are expected to vest 1,900,000   1,900,000  
Weighted average grant date fair market value, options expected to be exercised     $ 3.04  
Unrecognized compensation expense, weighted-average period of recognition     2 years 6 months  
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation (income) expense 3.8 5.2 15.8 19.6
Unrecognized share-based compensation cost 20.6   20.6  
Unrecognized compensation expense, weighted-average period of recognition     2 years  
Equity instruments other than options expected to vest, shares 3,100,000   3,100,000  
Equity instruments other than options expected to vest, weighted-average grant date fair value $ 11.79   $ 11.79  
Granted, Shares     1,048,000  
Performance Share Unit Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation (income) expense (0.6) 0.3 0.4 0.9
Unrecognized share-based compensation cost $ 2.5   $ 2.5  
Unrecognized compensation expense, weighted-average period of recognition     2 years  
Granted, Shares     233,000 235,000
Equity instruments other than options, maximum expected grants in period     233,000 117,500
Equity instruments other than options, maximum percentage of expected grants in period       50.00%
Performance Share Unit Awards [Member] | Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity instruments other than options, minimum expected grants in period     116,500  
Equity instruments other than options, maximum expected grants in period     233,000  
Performance Share Unit Awards [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity instruments other than options, minimum expected grants in period       117,500
Equity instruments other than options, maximum expected grants in period       235,000