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Goodwill and Other Intangible Assets - Changes in goodwill by reportable segment (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Goodwill by reportable segment    
Gross balance at the beginning of the period $ 299.6 $ 306.5
Foreign currency impact 3.3 (6.9)
Gross balance at the end of the year $ 302.9 $ 299.6