Earnings and Dividends per Common Share - Summary of Computation of Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Earnings Per Share [Abstract]
Net (loss) income	$ (147.5)	$ 16.4	$ (140.4)	$ 2.5
Weighted average common shares outstanding (in thousands):
Basic (in shares)	19,128	19,883	19,338	20,123
Effect of dilutive securities (in shares)	0	352	0	333
Diluted (in shares)	19,128	20,235	19,338	20,456
(Loss) earnings per common share:
Basic (in dollars per share)	$ (7.71)	$ 0.83	$ (7.26)	$ 0.13
Diluted (in dollars per share)	$ (7.71)	$ 0.81	$ (7.26)	$ 0.12
Antidilutive securities excluded from computation of diluted earnings per common share (in shares)	701,000	714,000	715,000	771,000

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