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Long-Term Incentive Employee Compensation Costs (Detail) (USD $)
In Millions, 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 expense, equity-based awards $ 3.6 $ 3.6 $ 9.4 $ 10.7
Share-based compensation expense, liability-based awards 0.8 4.7 1.1 7.0
Total share-based compensation expense in operating income (loss) 4.4 8.3 10.5 17.7
Less: tax benefit 1.6 2.9 3.7 6.2
Share-based compensation expense, net of tax $ 2.8 $ 5.4 $ 6.8 $ 11.5