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Goodwill and Other Intangible Assets - Changes in carrying amount of goodwill by reportable segment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill    
Gross balance at the beginning of the period $ 306.5 $ 325.3
Foreign currency impact (6.9) (18.8)
Gross balance at the end of the year $ 299.6 $ 306.5