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Debt - Schedule of outstanding debt (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Carrying amount $ 281.5 $ 281.5
Deferred financing costs (3.7) (4.0)
Short-term borrowings and current portion of long-term debt (12.9) (12.4)
Long-term debt 268.6 269.1
Other    
Debt Instrument [Line Items]    
Carrying amount $ 34.9 $ 35.7