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Employee Benefit Plans (Fair Value Measurement of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 159.7 $ 147.2 $ 145.7
Cash/Money Markets [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 4.9 4.6  
Foreign Government/Treasury Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 15.6 9.0  
Corporate Bonds, Debentures [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 32.0 30.3  
Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 28.8 26.7  
Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 8.8 7.7  
Investment and Insurance Annuity Contracts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 69.6 68.9  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 20.5 12.9  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash/Money Markets [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 4.9 4.6  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Government/Treasury Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 15.6 8.3  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Bonds, Debentures [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Investment and Insurance Annuity Contracts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Significant Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 92.0 86.7  
Significant Observable Inputs (Level 2) [Member] | Cash/Money Markets [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Significant Observable Inputs (Level 2) [Member] | Foreign Government/Treasury Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.7  
Significant Observable Inputs (Level 2) [Member] | Corporate Bonds, Debentures [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 32.0 29.7  
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 28.8 26.7  
Significant Observable Inputs (Level 2) [Member] | Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 8.8 7.7  
Significant Observable Inputs (Level 2) [Member] | Investment and Insurance Annuity Contracts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 22.4 21.9  
Significant Unobservable Inputs (Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 47.2 47.6 52.2
Significant Unobservable Inputs (Level 3) [Member] | Cash/Money Markets [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government/Treasury Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) [Member] | Corporate Bonds, Debentures [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.6 0.7
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) [Member] | Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) [Member] | Investment and Insurance Annuity Contracts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 47.2 $ 47.0 $ 51.5