Fair Value Measurement - Carrying Value and Estimated Fair Value Table (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value Measurement
Long-term borrowings	$ 214.1	$ 225.1
Carrying Amount
Fair Value Measurement
Cash and cash equivalents	19.3	18.7
Fair Value
Fair Value Measurement
Cash and cash equivalents	19.3	18.7
Senior credit facility
Fair Value Measurement
Long-term borrowings	212.3	223.1
Senior credit facility | Carrying Amount
Fair Value Measurement
Long-term borrowings	212.3	223.1
Senior credit facility | Fair Value
Fair Value Measurement
Long-term borrowings	212.3	223.1
Other debt obligations
Fair Value Measurement
Long-term borrowings	1.8	2.0
Other debt obligations | Carrying Amount
Fair Value Measurement
Long-term borrowings	1.8	2.0
Other debt obligations | Fair Value
Fair Value Measurement
Long-term borrowings	$ 1.8	$ 2.0