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Fair Value (Details)
$ in Millions
Sep. 30, 2017
USD ($)
employee
Dec. 31, 2016
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Life insurance, number of employees | employee 4  
Life insurance, face amount $ 11.1  
Carrying (reported) amount, fair value disclosure    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of debt $ 82.1 $ 104.6