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Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Authorized 7,400,000    
Tax Benefit from Compensation Expense $ 3.4 $ 3.5 $ 1.8
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Minimum payout range 0.00%    
Maximum payout range 200.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Total Compensation Cost Not yet Recognized $ 11.6    
Performance Units Related to Earnings Per Share [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 87,308 [1] 86,857 94,735
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 31.03 $ 34.83 $ 26.64
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 251,825 241,518  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 87,308 [1] 86,857 94,735
Equity Instruments Other than Options, Converted in Period [2] (67,148)    
Equity Instruments Other than Options, Forfeited in Period (9,853)    
Awards Other than Options, Fully Vested 91,356    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value $ 1.2    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value 7.2    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value 14.1    
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value $ 6.8    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Equity Instruments Other than Options, Nonvested, Number, Beginning Balance 174,370    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 87,308 [1] 86,857 94,735
Equity Instruments Other than Options, Vested in Period (91,356)    
Equity Instruments Other than Options, Forfeited in Period (9,853)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance 160,469 174,370  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 32.82 $ 30.58  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 31.03 $ 34.83 $ 26.64
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 26.93    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 31.94    
Awards Other than Options, Vested and Expected to Vest, Outstanding [3] 154,678    
Fair Value of Vested Performance Units and Restricted Stock $ 4.9 $ 1.2 $ 0.0
Total Compensation Cost Not yet Recognized $ 2.5    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 7 months 28 days    
Total Shareholder Return [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 261,916 [1] 260,570 284,211
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 36.86 $ 41.77 $ 20.97
Expected Dividend Rate 3.60% 3.80% 3.50%
Expected Volatility Rate 19.00% 19.90% 19.80%
Risk Free Interest Rate 2.38% 1.44% 0.88%
Expected Term 2 years 10 months 10 days 2 years 9 months 18 days 2 years 10 months 2 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 755,480 724,551  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 261,916 [1] 260,570 284,211
Equity Instruments Other than Options, Converted in Period [2] (201,431)    
Equity Instruments Other than Options, Forfeited in Period (29,556)    
Awards Other than Options, Fully Vested 274,078    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value $ 0.0    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value 19.8    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value 53.2    
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value $ 32.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Equity Instruments Other than Options, Nonvested, Number, Beginning Balance 523,120    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 261,916 [1] 260,570 284,211
Equity Instruments Other than Options, Vested in Period (274,078)    
Equity Instruments Other than Options, Forfeited in Period (29,556)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance 481,402 523,120  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 39.17 $ 30.96  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 36.86 $ 41.77 $ 20.97
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 21.69    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 35.55    
Awards Other than Options, Vested and Expected to Vest, Outstanding [3] 464,027    
Fair Value of Vested Performance Units and Restricted Stock $ 5.9 $ 6.3 $ 6.4
Total Compensation Cost Not yet Recognized $ 9.0    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 7 months 24 days    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Expense $ 13.3 9.0 4.5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Total Compensation Cost Not yet Recognized 11.5    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Expense $ 0.1 $ 0.1 $ 0.1
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 826 3,145 1,881
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 36.28 $ 34.96 $ 29.27
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 2,711 4,242  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 826 3,145 1,881
Equity Instruments Other than Options, Forfeited in Period 0    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value $ 0.1    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value $ 0.1    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Equity Instruments Other than Options, Nonvested, Number, Beginning Balance 4,242    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 826 3,145 1,881
Equity Instruments Other than Options, Vested in Period (2,357)    
Equity Instruments Other than Options, Forfeited in Period 0    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance 2,711 4,242  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 35.00 $ 33.58  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 36.28 $ 34.96 $ 29.27
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 32.84    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 0.00    
Awards Other than Options, Vested and Expected to Vest, Outstanding 2,711    
Fair Value of Vested Performance Units and Restricted Stock $ 0.1 $ 0.1 $ 0.1
Total Compensation Cost Not yet Recognized $ 0.1    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 11 months 9 days    
Stock Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Expense, Net of Unconsolidated Affiliates $ 13.4 9.1 4.6
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Expense 5.1 1.4 0.0
Total Shareholder Return [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Expense $ 8.2 $ 7.6 $ 4.5
Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 26,211 2,298 2,100
[1] For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from zero percent to 200 percent of the target.
[2] These amounts represent performance units that vested at December 31, 2017 which were settled in February 2018.
[3] The intrinsic value of the performance units based on total shareholder return and earnings per share is $32.0 million