Fair Value Measurement - Carrying Value and Estimated Fair Value Table (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair Value Measurement
Long-term borrowings	$ 153.8	$ 195.1
Carrying Amount
Fair Value Measurement
Cash and cash equivalents	22.8	22.2
Fair Value
Fair Value Measurement
Cash and cash equivalents	22.8	22.2
Restated Credit Facility, net of original discount on borrowings and deferred financing costs
Fair Value Measurement
Long-term borrowings	151.0	193.4
Restated Credit Facility, net of original discount on borrowings and deferred financing costs | Carrying Amount
Fair Value Measurement
Long-term borrowings	151.0	193.4
Restated Credit Facility, net of original discount on borrowings and deferred financing costs | Fair Value
Fair Value Measurement
Long-term borrowings	151.0	193.4
Other borrowings
Fair Value Measurement
Long-term borrowings	2.8	1.7
Other borrowings | Carrying Amount
Fair Value Measurement
Long-term borrowings	2.8	1.7
Other borrowings | Fair Value
Fair Value Measurement
Long-term borrowings	$ 2.8	$ 1.7