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Fair Value Measurements Fair Value Disclosures (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Sep. 10, 2016
Fair Value Disclosures [Abstract]      
Debt, Carrying Value $ 796.2 $ 820.2 $ 1,051.8
Debt, Fair Value $ 815.2 $ 827.6 $ 1,092.1