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Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
8 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares Authorized   7,400,000    
Tax Benefit from Compensation Expense   $ 3.1 $ 3.3 $ 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   $ 9.2    
Options, Exercises in Period, Total Intrinsic Value [1]       1.4
Cash Received from Exercise of Stock Options       $ 0.4
2013 Performance Units Grants [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 91,390      
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, Granted 91,390      
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, Non-Option Equity Instruments, Granted 91,390      
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   88,156 [2] 73,037 74,570
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 33.99 $ 34.81 $ 26.73
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   241,470 297,687  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   88,156 [2] 73,037 74,570
Equity Instruments Other than Options, Converted in Period   (114,366)    
Equity Instruments Other than Options, Forfeited in Period   (30,007)    
Awards Other than Options, Fully Vested   109,154    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value [3]   $ 4.9    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value   0.0    
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value   $ 0.0    
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   185,737    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   88,156 [2] 73,037 74,570
Equity Instruments Other Than Options, Modification [4]   (2,416)    
Equity Instruments Other than Options, Vested in Period   (109,154)    
Equity Instruments Other than Options, Forfeited in Period   (30,007)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance   132,316 185,737  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 34.30 $ 29.90  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   33.99 $ 34.81 $ 26.73
Equity Instruments Other than Options, Modifications in Period, Weighted Average Grant Date Fair Value   28.95    
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   26.73    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value   $ 32.95    
Awards Other than Options, Vested and Expected to Vest, Outstanding [4]   130,274    
Equity Instruments Other than Options, Expected to Vest, Intrinsic Value   $ 0.0    
Fair Value of Vested Performance Units and Restricted Stock   0.0 $ 3.8 $ 4.9
Total Compensation Cost Not yet Recognized   $ 2.4    
Total Compensation Cost Not yet Recognized, Period for Recognition   1 year 8 months 9 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   264,454 [2] 219,106 316,162
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 31.02 $ 34.80 $ 25.89
Expected Dividend Rate   2.60% 2.50% 2.80%
Expected Volatility Rate   16.90% 20.00% 20.00%
Risk Free Interest Rate   0.91% 0.67% 0.37%
Expected Term   2 years 10 months 6 days 2 years 10 months 10 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   724,058 892,991  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   264,454 [2] 219,106 316,162
Equity Instruments Other than Options, Converted in Period   (343,395)    
Equity Instruments Other than Options, Forfeited in Period   (89,992)    
Awards Other than Options, Fully Vested   327,115    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value [3]   $ 0.2    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value   0.0    
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value   $ 0.0    
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   556,844    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   264,454 [2] 219,106 316,162
Equity Instruments Other Than Options, Modification [4]   (7,248)    
Equity Instruments Other than Options, Vested in Period   (327,115)    
Equity Instruments Other than Options, Forfeited in Period   (89,992)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance   396,943 556,844  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 32.83 $ 29.38  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   31.02 $ 34.80 $ 25.89
Equity Instruments Other than Options, Modifications in Period, Weighted Average Grant Date Fair Value   28.95    
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   25.89    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value   $ 31.48    
Awards Other than Options, Vested and Expected to Vest, Outstanding [4]   390,820    
Equity Instruments Other than Options, Expected to Vest, Intrinsic Value   $ 0.0    
Fair Value of Vested Performance Units and Restricted Stock   8.5 $ 9.5 $ 8.2
Total Compensation Cost Not yet Recognized   $ 6.7    
Total Compensation Cost Not yet Recognized, Period for Recognition   1 year 8 months 5 days    
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation Expense   $ 8.3 12.0 10.7
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   9.1    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation Expense   $ 0.1 $ 0.0 $ 0.4
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   958 7,037 5,940
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 26.11 $ 35.71 $ 29.71
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   7,623 12,501  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   958 7,037 5,940
Equity Instruments Other than Options, Forfeited in Period   (1,064)    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value   $ 0.1    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value   $ 0.3    
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   12,501    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   958 7,037 5,940
Equity Instruments Other than Options, Vested in Period   (4,772)    
Equity Instruments Other than Options, Forfeited in Period   (1,064)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance   7,623 12,501  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 29.68 $ 32.65  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   26.11 $ 35.71 $ 29.71
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   32.33    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value   $ 25.87    
Awards Other than Options, Vested and Expected to Vest, Outstanding   7,623    
Fair Value of Vested Performance Units and Restricted Stock   $ 0.2 $ 0.2 $ 0.7
Total Compensation Cost Not yet Recognized   $ 0.1    
Total Compensation Cost Not yet Recognized, Period for Recognition   1 year 7 months 6 days    
Stock Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation Expense   $ 8.4 12.0 11.1
Amount paid by unconsolidated affiliates   0.5 3.6 3.1
Compensation Expense, Net of Unconsolidated Affiliates   7.9 8.4 8.0
2012 Performance Unit Grants [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 82,930      
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, Granted 82,930      
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, Non-Option Equity Instruments, Granted 82,930      
Performance Units Related to Earnings Per Share [Member] | 2013 Performance Units Grants [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 45,794      
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 26.73      
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, Granted 45,794      
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, Non-Option Equity Instruments, Granted 45,794      
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 26.73      
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation Expense   0.7 3.7 2.3
Performance Units Related to Earnings Per Share [Member] | 2012 Performance Unit Grants [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 41,376      
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 34.94      
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, Granted 41,376      
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, Non-Option Equity Instruments, Granted 41,376      
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 34.94      
Total Shareholder Return [Member] | 2013 Performance Units Grants [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 45,596      
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 25.89      
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, Granted 45,596      
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, Non-Option Equity Instruments, Granted 45,596      
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 25.89      
Total Shareholder Return [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation Expense   $ 7.6 $ 8.3 $ 8.4
Total Shareholder Return [Member] | 2012 Performance Unit Grants [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 41,554      
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 47.71      
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, Granted 41,554      
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, Non-Option Equity Instruments, Granted 41,554      
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 47.71      
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   82,046 494,637 548,344
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Paid for Tax Withholding   1,070    
[1] The difference between the market value on the date of exercise and the option exercise price.
[2] 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 0 percent to 200 percent of the target.
[3] These amounts represent performance units that vested at December 31, 2014 which were settled in February 2015.
[4] There is no intrinsic value of the performance units based on total shareholder return and earnings per share.