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Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Senior unsecured notes, maturing 2024 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes Payable, Fair Value Disclosure $ 352.6 $ 344.3