Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share, Basic and Diluted [Line Items]
Net income	$ 55.5	$ 72.7	$ 173.9	$ 196.0
Weighted average common shares outstanding for basic earnings per share computation (in shares)	102,970,851	103,822,311	102,917,610	103,793,851
Dilutive effects of stock-based compensation (in shares)	262,767	4,116	207,449	30,425
Weighted average common shares outstanding for diluted earnings per common share computation (in shares)	103,233,618	103,826,427	103,125,059	103,824,276
Basic earnings per common share (in dollars per share)	$ 0.54	$ 0.70	$ 1.69	$ 1.89
Diluted earnings per common share (in dollars per share)	$ 0.54	$ 0.70	$ 1.69	$ 1.89
Restricted Stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)	5,841	162,231	47,854	162,231
Unvested restricted stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)			773,563	967,996