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Stock Incentive Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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   1.50% 1.31% 1.07%
Aggregate shares of common stock authorized for issuance under the 2007 stock incentive plan   3,282,170    
Remaining shares available for grant   1,916,131    
Share-based compensation   $ 17.4 $ 18.1 $ 18.4
Unrecorded compensation cost   $ 19.2    
Weighted average remaining contractual terms   1 year 7 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   17.70% 16.30% 15.10%
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Payout Percentage 62.50% 94.70% 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   $ 48.10 $ 45.56 $ 45.18
Units paid, weighted average grant date fair value   39.72    
Units canceled, weighted average grant date fair value   45.61    
Outstanding units granted, weighted average grant date fair value   $ 45.84 $ 42.05  
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 566 746    
Units granted   214    
Units paid   (329)    
Units canceled   (65)    
Outstanding units granted at the end of the year   566 746  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units granted, weighted average grant date fair value   $ 53.43 $ 48.48 $ 53.14
Units paid, weighted average grant date fair value   46.33    
Units canceled, weighted average grant date fair value   50.28    
Outstanding units granted, weighted average grant date fair value   $ 51.35 $ 49.43  
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 525 438    
Units granted   241    
Units paid   (105)    
Units canceled   (49)    
Outstanding units granted at the end of the year   525 438  
Continuing Operations [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation   $ 17.4 $ 18.1 $ 18.4