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Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Authorized 7,400,000    
Tax Benefit from Compensation Expense $ 3.5 $ 1.8 $ 3.1
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 $ 11.2    
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 86,857 94,735 88,156
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 34.83 $ 26.64 $ 33.99
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 241,518 221,350  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 86,857 94,735 88,156
Equity Instruments Other than Options, Converted in Period (61,742)    
Equity Instruments Other than Options, Forfeited in Period (4,947)    
Awards Other than Options, Fully Vested 67,148    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value [1] $ 0.0    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value 1.2    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value 7.2    
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value $ 5.7    
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 159,608    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 86,857 94,735 88,156
Equity Instruments Other than Options, Vested in Period (67,148)    
Equity Instruments Other than Options, Forfeited in Period (4,947)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance 174,370 159,608  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 30.58 $ 29.71  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 34.83 $ 26.64 $ 33.99
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 33.99    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 31.12    
Awards Other than Options, Vested and Expected to Vest, Outstanding [2] 164,148    
Fair Value of Vested Performance Units and Restricted Stock $ 1.2 $ 0.0 $ 0.0
Total Compensation Cost Not yet Recognized $ 2.6    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 8 months 1 day    
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 260,570 284,211 264,454
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 41.77 $ 20.97 $ 31.02
Expected Dividend Rate 3.80% 3.50% 2.60%
Expected Volatility Rate 19.90% 19.80% 16.90%
Risk Free Interest Rate 1.44% 0.88% 0.91%
Expected Term 2 years 9 months 18 days 2 years 10 months 2 days 2 years 10 months 6 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 724,551 664,045  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 260,570 284,211 264,454
Equity Instruments Other than Options, Converted in Period (185,214)    
Equity Instruments Other than Options, Forfeited in Period (14,850)    
Awards Other than Options, Fully Vested 201,431    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value [1] $ 0.0    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value 0.0    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value 2.4    
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value $ 2.3    
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 478,831    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 260,570 284,211 264,454
Equity Instruments Other than Options, Vested in Period (201,431)    
Equity Instruments Other than Options, Forfeited in Period (14,850)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance 523,120 478,831  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 30.96 $ 25.16  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 41.77 $ 20.97 $ 31.02
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 31.18    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 31.01    
Awards Other than Options, Vested and Expected to Vest, Outstanding [2] 492,446    
Fair Value of Vested Performance Units and Restricted Stock $ 6.3 $ 6.4 $ 8.5
Total Compensation Cost Not yet Recognized $ 8.5    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 9 months    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Expense $ 9.0 4.5 8.3
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 11.1    
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 3,145 1,881 958
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 34.96 $ 29.27 $ 26.11
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 4,242 4,912  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 3,145 1,881 958
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 4,912    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 3,145 1,881 958
Equity Instruments Other than Options, Vested in Period (3,815)    
Equity Instruments Other than Options, Forfeited in Period 0    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance 4,242 4,912  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 33.58 $ 31.29  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 34.96 $ 29.27 $ 26.11
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 31.71    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 0.00    
Awards Other than Options, Vested and Expected to Vest, Outstanding 4,242    
Fair Value of Vested Performance Units and Restricted Stock $ 0.1 $ 0.1 $ 0.2
Total Compensation Cost Not yet Recognized $ 0.1    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 4 months 2 days    
Stock Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Expense $ 9.1 4.6 8.4
Amount paid by unconsolidated affiliates 0.0 0.0 0.5
Compensation Expense, Net of Unconsolidated Affiliates 9.1 4.6 7.9
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Expense 1.4 0.0 0.7
Total Shareholder Return [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Expense $ 7.6 $ 4.5 $ 7.6
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 2,298 2,100 82,046
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Paid for Tax Withholding 146    
[1] These amounts represent performance units that vested at December 31, 2016 which were settled in February 2017.
[2] The intrinsic value of the performance units based on total shareholder return and earnings per share is $2.3 million