Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Feb. 18, 2016
Senior Notes due 2024 | Senior Notes
Financial assets and liabilities accounted for at fair value on a recurring basis
Interest rate, stated percentage (as a percent)	9.50%		9.50%
Debt instruments at fair value	$ 491.0	$ 496.2
Term loan B | Senior Secured
Financial assets and liabilities accounted for at fair value on a recurring basis
Debt instruments at fair value	$ 827.1	$ 838.4