Net Income (Loss) Per Common Share - Summary of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Basic net income (loss) per common share:
Net income (loss)	$ 17.8	$ (14.0)
Weighted average common shares outstanding - Basic (in shares)	84,300,000	84,000,000.0
Basic net income (loss) per common share	$ 0.21	$ (0.17)
Diluted net income (loss) per common share:
Net income (loss)	$ 17.8	$ (14.0)
Weighted average common shares outstanding - Basic (in shares)	84,300,000	84,000,000.0
Plus incremental shares from assumed conversions:
Weighted average common shares outstanding - Dilutive (in shares)	84,900,000	84,000,000.0
Diluted net income (loss) per common share	$ 0.21	$ (0.17)
Restricted Stock Units
Plus incremental shares from assumed conversions:
Incremental shares from assumed conversions	0.4	0
Stock Options
Plus incremental shares from assumed conversions:
Incremental shares from assumed conversions	0.2	0