Debt - Summary of Components of Long-Term Borrowings and Capital Lease Obligations (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Amended 2016 Credit Agreement (a)	[1]	$ 266.5	$ 277.0
Capital lease obligations		0.8	0.7
Total long-term borrowings and capital lease obligations, including current portion		267.3	277.7
Less: Current capital lease obligations		0.3	0.3
Total long-term borrowings and capital lease obligations		$ 267.0	$ 277.4

[1] Defined as the Amended and Restated Credit Agreement, dated January 27, 2016, as amended on June 2, 2017.