Earnings (Loss) per Common Share - Schedule of Calculations of Basic and Diluted Earnings (Loss) per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income (loss)	$ 43.9	$ (6.9)
Dividends allocated to participating securities	(0.1)	(0.1)
Earnings (loss) available for common stockholders used in calculation of basic earnings (loss) per common share	$ 43.8	$ (7.0)
Weighted average number of common shares outstanding, basic (in shares)	49.2	48.7
Basic earnings (loss) per common share (in dollars per share)	$ 0.89	$ (0.14)
Dividends allocated to participating securities	$ (0.1)	$ (0.1)
Earnings (loss) available for common stockholders used in calculation of diluted earnings (loss) per common share	$ 43.8	$ (7.0)
Effect of shares issuable under share-based compensation plans (in shares)	0.7	0.0
Weighted average number of common shares outstanding, diluted (in shares)	49.9	48.7
Diluted earnings (loss) per common share (in dollars per share)	$ 0.88	$ (0.14)