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Goodwill and Other Intangible Assets - Changes in goodwill by reportable segment (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Goodwill by reportable segment    
Balance at the beginning of the period $ 299.6 $ 306.5
Foreign currency impact 18.1 (6.9)
Balance at the end of the period $ 317.7 $ 299.6