Fair Value Measurement - Carrying Value and Estimated Fair Value Table (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value Measurement
Long-term debt	$ 234.3	$ 225.1
Carrying Amount
Fair Value Measurement
Cash and cash equivalents	30.8	18.7
Fair Value
Fair Value Measurement
Cash and cash equivalents	30.8	18.7
Senior credit facility, net of discount
Fair Value Measurement
Long-term debt	232.4	223.1
Senior credit facility, net of discount | Carrying Amount
Fair Value Measurement
Long-term debt	232.4	223.1
Senior credit facility, net of discount | Fair Value
Fair Value Measurement
Long-term debt	232.4	223.1
Other debt obligations
Fair Value Measurement
Long-term debt	1.9	2.0
Other debt obligations | Carrying Amount
Fair Value Measurement
Long-term debt	1.9	2.0
Other debt obligations | Fair Value
Fair Value Measurement
Long-term debt	$ 1.9	$ 2.0