Debt - Summary of Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Current portion of long-term borrowings and capital lease obligations		$ 0.3	$ 0.5
Long-term Debt
Debt Instrument [Line Items]
Notional Amount	[1]	277.7	64.0
Fair Value	[1]	$ 277.7	$ 64.0

[1] Long-term debt includes current portions of long-term debt and current portions of capital lease obligations of $0.3 million and $0.5 million as of December 31, 2017 and 2016, respectively.