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Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current and long-term debt $ (867.8) $ (880.8)
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current and long-term debt $ (881.4) $ (904.9)