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Debt - Long-term Borrowings (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term Debt and Capital Lease Obligations, Including Current Maturities $ 283.1 $ 64.0
Current portion of long-term borrowings and capital lease obligations 0.2 0.5
Notional Amount    
Debt Instrument [Line Items]    
Long-term Debt and Capital Lease Obligations, Including Current Maturities [1] 283.1 64.0
Fair Value    
Debt Instrument [Line Items]    
Long-term Debt and Capital Lease Obligations, Including Current Maturities [1] $ 283.1 $ 64.0
[1] Long-term borrowings includes current portions of long-term debt and current portions of capital lease obligations of $0.2 million and $0.5 million as of September 30, 2017 and December 31, 2016, respectively.