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Long-Term Incentive Employee Compensation - Long-Term Incentive Employee Compensation Costs (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Share Based Compensation Arrangement [Line Items]      
Share-based compensation expense, equity-based awards $ 12.9 $ 23.3 $ 13.7
Share-based compensation expense, liability-based awards 1.9 2.1 (3.8)
Total share-based compensation expense in operating income (loss) 14.8 25.4 9.9
Tax benefit 5.4 8.5 3.1
Share-based compensation expense, net of tax $ 9.4 $ 16.9 $ 6.8