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Stock Incentive Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate shares of common stock authorized for issuance under the 2007 stock incentive plan 6,000,000    
Remaining shares available for grant 4,189,756    
Percentage of stock awards granted that are subject to total shareholder return conditions 45.00% 38.00% 18.00%
Share-based compensation $ 17.6 $ 16.3 $ 18.4
Unrecorded compensation cost $ 22.6    
Weighted average remaining contractual terms 1 year 9 months 6 days    
Units granted, weighted average grant date fair value $ 33.88    
Units paid, weighted average grant date fair value $ 30.68    
Units canceled, weighted average grant date fair value $ 32.10    
Outstanding units granted, weighted average grant date fair value $ 32.19 $ 31.75  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding units granted at the beginning of the year 2,891,298    
Units granted 286,985    
Units paid (499,085)    
Units canceled (107,850)    
Outstanding units granted at the end of the year 2,571,348 2,891,298  
Aggregate intrinsic value at year end of outstanding awards, in millions $ 86,000,000    
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 6 years