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Goodwill and Other Intangible Assets - Changes in goodwill by reportable segment (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Goodwill by reportable segment    
Gross balance at the beginning of the period $ 306.5 $ 325.3
Foreign currency impact 1.0 (18.8)
Gross balance at the end of the year 307.5 306.5
Accumulated asset impairments 0.0  
Goodwill $ 307.5 $ 306.5