Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share, Basic and Diluted [Line Items]
Net income	$ 60.0	$ 67.0	$ 118.4	$ 123.3
Weighted average common shares outstanding for basic earnings per share computation (in shares)	102,936,996	103,820,649	102,890,697	103,779,386
Dilutive effects of stock-based compensation (in shares)	156,139	2,242	184,746	42,539
Weighted average common shares outstanding for diluted earnings per common share computation (in shares)	103,093,135	103,822,891	103,075,443	103,821,925
Basic earnings per common share (in dollars per share)	$ 0.58	$ 0.65	$ 1.15	$ 1.19
Diluted earnings per common share (in dollars per share)	$ 0.58	$ 0.65	$ 1.15	$ 1.19
Restricted Stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)	55,785	222,417	55,953	129,449
Unvested restricted stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)			786,790	974,875