Earnings (Loss) Per Share - Schedule of Basic and Dilutive Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Basic and dilutive net income (loss)	$ (15.3)	$ (16.0)	$ (23.6)	$ (49.1)	$ 17.5	$ 2.9	$ 14.4	$ (14.6)	$ (104.0)	$ 20.2	$ (10.8)
Basic weighted average shares outstanding									33,252	32,983	32,685
Effect of dilutive securities:
Unvested shares and stock units									0	876	0
Dilutive weighted average shares outstanding									33,252	33,859	32,685
Basic earnings (loss) per share									$ (3.13)	$ 0.61	$ (0.33)
Diluted earnings (loss) per share									$ (3.13)	$ 0.60	$ (0.33)