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Stock Incentive Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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   2.01% 1.50% 1.31%
Aggregate shares of common stock authorized for issuance under the 2007 stock incentive plan   3,282,170    
Remaining shares available for grant   1,290,386    
Share-based compensation   $ 19.6 $ 17.4 $ 18.1
Unrecorded compensation cost   $ 20.1    
Weighted average remaining contractual terms   1 year 3 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   20.00% 17.70% 16.30%
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Payout Percentage 87.50% 62.50% 94.70% 93.70%
Time Based Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units granted, weighted average grant date fair value   $ 46.30 $ 48.10 $ 45.56
Units paid, weighted average grant date fair value   44.92    
Units canceled, weighted average grant date fair value   46.80    
Outstanding units granted, weighted average grant date fair value   $ 46.51 $ 45.84  
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 482 566    
Units granted   208    
Units paid   (271)    
Units canceled   (21)    
Outstanding units granted at the end of the year   482 566  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units granted, weighted average grant date fair value   $ 54.10 $ 53.43 $ 48.48
Units paid, weighted average grant date fair value   53.14    
Units canceled, weighted average grant date fair value   52.77    
Outstanding units granted, weighted average grant date fair value   $ 52.17 $ 51.35  
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 684 525    
Units granted   269    
Units paid   (57)    
Units canceled   (53)    
Outstanding units granted at the end of the year   684 525  
Continuing Operations [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation   $ 19.6 $ 17.4 $ 18.1