Earnings (Loss) Per Share - Schedule of Basic and Dilutive Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Basic and dilutive net income (loss)	$ (53.5)	$ (104.0)	$ 20.2
Basic weighted average shares outstanding	41,694	33,252	32,983
Effect of dilutive securities:
Unvested shares and stock units	0	0	876
Dilutive weighted average shares outstanding	41,694	33,252	33,859
Basic earnings (loss) per share	$ (1.28)	$ (3.13)	$ 0.61
Diluted earnings (loss) per share	$ (1.28)	$ (3.13)	$ 0.60