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Stock Incentive Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.37% 0.40% 1.03%
Aggregate shares of common stock authorized for issuance under the 2007 stock incentive plan 6,000,000    
Remaining shares available for grant 3,597,459    
Share-based compensation $ 16.4 $ 17.6 $ 16.3
Unrecorded compensation cost $ 18.2    
Weighted average remaining contractual terms 1 year 8 months 21 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 21.90% 27.70% 33.90%
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Payout Percentage 54.70%    
Time Based Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted, weighted average grant date fair value $ 33.75 $ 30.61 $ 32.14
Units paid, weighted average grant date fair value $ 32.79    
Units canceled, weighted average grant date fair value $ 30.93    
Outstanding units granted, weighted average grant date fair value $ 30.35 $ 30.80  
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 2,150    
Units granted 398    
Units paid (927)    
Units canceled (150)    
Outstanding units granted at the end of the year 1,471 2,150  
Performance Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted, weighted average grant date fair value $ 36.98 $ 39.10 $ 41.80
Units paid, weighted average grant date fair value $ 38.01    
Units canceled, weighted average grant date fair value $ 37.58    
Outstanding units granted, weighted average grant date fair value $ 37.95 $ 39.26  
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 422    
Units granted 146    
Units paid (106)    
Units canceled (115)    
Outstanding units granted at the end of the year 347 422