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Employee Benefit Plans Defined Benefit Plan - Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 48.5 $ 41.1 $ 41.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance 1.3 0.3  
Purchases, sales and settlements, net (2.4) (4.2)  
Transfers, net 4.0 5.2  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 2.9 1.3  
Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 45.6 39.8  
Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2.9 1.3  
Equity Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 33.0 28.1  
Equity Funds [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 33.0 28.1  
Equity Funds [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Fixed Income Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 12.6 11.7  
Fixed Income Funds [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 12.6 11.7  
Fixed Income Funds [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Other Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2.9 1.3  
Other Investments [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Other Investments [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 2.9 $ 1.3  
Minimum [Member] | Equity Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage 60.00%    
Minimum [Member] | Fixed Income Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage 26.00%    
Minimum [Member] | Other Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage 3.00%    
Maximum [Member] | Equity Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage 68.00%    
Maximum [Member] | Fixed Income Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage 30.00%    
Maximum [Member] | Other Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage 6.00%