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Fair Value Measurements Level 3 (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Level 3 Fair Value Measurements [Roll Forward]    
Balance, beginning of period $ 8.0 $ 6.0
Increase in fair value recorded in earnings 0.5 2.3
Payments (0.5) (0.3)
Balance, end of period $ 8.0 $ 8.0