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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, 2016
Dec. 31, 2015
Goodwill by reportable segment    
Gross balance at the beginning of the period $ 306.5 $ 325.3
Foreign currency impact 6.2 (18.8)
Gross balance at the end of the year $ 312.7 $ 306.5