Fair Value Measurement - Carrying Value and Estimated Fair Value Table (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value Measurement
Long-term borrowings	$ 146.1	$ 153.8
Carrying Amount
Fair Value Measurement
Cash and cash equivalents	28.5	22.8
Fair Value
Fair Value Measurement
Cash and cash equivalents	28.5	22.8
Restated Credit Facility, net of original discount on borrowings and deferred financing costs
Fair Value Measurement
Long-term borrowings	143.4	151.0
Restated Credit Facility, net of original discount on borrowings and deferred financing costs | Carrying Amount
Fair Value Measurement
Long-term borrowings	143.4	151.0
Restated Credit Facility, net of original discount on borrowings and deferred financing costs | Fair Value
Fair Value Measurement
Long-term borrowings	143.4	151.0
Other borrowings
Fair Value Measurement
Long-term borrowings	2.7	2.8
Other borrowings | Carrying Amount
Fair Value Measurement
Long-term borrowings	2.7	2.8
Other borrowings | Fair Value
Fair Value Measurement
Long-term borrowings	$ 2.7	$ 2.8