Net Income (Loss) Per Common Share - Summary of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Basic net income (loss) per common share:
Net income (loss)	$ 26.8	$ 44.7	$ 17.8	$ 9.0	$ 2.2	$ (14.0)	$ 89.3	$ (2.8)
Weighted average common shares outstanding - Basic (in shares)	84,400,000			84,100,000			84,400,000	84,100,000
Basic net income (loss) per common share	$ 0.32			$ 0.11			$ 1.06	$ (0.03)
Diluted net income (loss) per common share:
Net income (loss)	$ 26.8			$ 9.0			$ 89.3	$ (2.8)
Weighted average common shares outstanding - Basic (in shares)	84,400,000			84,100,000			84,400,000	84,100,000
Plus incremental shares from assumed conversions:
Weighted average common shares outstanding - Dilutive (in shares)	85,100,000			84,700,000			85,000,000.0	84,100,000
Diluted net income (loss) per common share	$ 0.31			$ 0.11			$ 1.05	$ (0.03)
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	0.3			0.3			0.2	0