Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Earnings Per Share, Basic and Diluted [Line Items]
Net income	$ 83.9	$ 71.7	$ 144.1	$ 121.9
Weighted average common shares outstanding for basic earnings per share computation (in shares)	96,583,247	103,260,996	97,725,651	103,177,077
Dilutive effects of stock-based compensation (in shares)	202,702	102,696	287,046	226,986
Weighted average common shares outstanding for diluted earnings per common share computation (in shares)	96,785,949	103,363,692	98,012,697	103,404,063
Basic earnings per common share (in dollars per share)	$ 0.87	$ 0.69	$ 1.47	$ 1.18
Diluted earnings per common share (in dollars per share)	$ 0.87	$ 0.69	$ 1.47	$ 1.18
Restricted Stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)	0	428,989	0	915
Unvested restricted stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)			538,694	798,491