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Stock Incentive Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 1.07% 0.76% 0.37%
Aggregate shares of common stock authorized for issuance under the 2007 stock incentive plan 3,282,170    
Remaining shares available for grant 3,078,025    
Share-based compensation $ 18.4 $ 12.4 $ 16.4
Unrecorded compensation cost $ 17.2    
Weighted average remaining contractual terms 8 months 1 day    
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 15.10% 19.70% 21.90%
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Payout Percentage 93.70% 59.50%  
Time Based Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted, weighted average grant date fair value $ 45.18 $ 40.65 $ 33.75
Units paid, weighted average grant date fair value 33.55    
Units canceled, weighted average grant date fair value 35.16    
Outstanding units granted, weighted average grant date fair value $ 35.55 $ 33.13  
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 1,526    
Units granted 309    
Units paid (304)    
Units canceled (106)    
Outstanding units granted at the end of the year 1,425 1,526  
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted, weighted average grant date fair value $ 53.14 $ 46.42 $ 36.98
Units paid, weighted average grant date fair value 34.99    
Units canceled, weighted average grant date fair value 39.94    
Outstanding units granted, weighted average grant date fair value $ 44.68 $ 40.11  
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 372    
Units granted 92    
Units paid (60)    
Units canceled (71)    
Outstanding units granted at the end of the year 333 372  
Continuing Operations [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation $ 18.4 $ 14.0 $ 15.9