Net Income (Loss) Per Common Share - Summary of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Basic net income (loss) per common share:
Net income (loss)	$ 44.7	$ 17.8	$ 2.2	$ (14.0)	$ 62.5	$ (11.8)
Weighted average common shares outstanding - Basic (in shares)	84,400,000		84,100,000		84,300,000	84,000,000.0
Basic net income (loss) per common share	$ 0.53		$ 0.03		$ 0.74	$ (0.14)
Diluted net income (loss) per common share:
Net income (loss)	$ 44.7		$ 2.2		$ 62.5	$ (11.8)
Weighted average common shares outstanding - Basic (in shares)	84,400,000		84,100,000		84,300,000	84,000,000.0
Plus incremental shares from assumed conversions:
Weighted average common shares outstanding - Dilutive (in shares)	85,000,000.0		84,700,000		84,900,000	84,000,000.0
Diluted net income (loss) per common share	$ 0.53		$ 0.03		$ 0.74	$ (0.14)
Restricted Stock Units
Plus incremental shares from assumed conversions:
Incremental shares from assumed conversions	0.4		0.3		0.4	0
Stock Options
Plus incremental shares from assumed conversions:
Incremental shares from assumed conversions	0.2		0.3		0.2	0