Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share, Basic and Diluted [Line Items]
Net income	$ 85.7	$ 47.1	$ 116.4	$ 141.0
Weighted average common shares outstanding for basic earnings per share computation (in shares)	106,525,974	61,673,656	102,879,422	61,641,342
Dilutive effects of stock-based compensation (in shares)	63,725	74,316	55,938	91,480
Weighted average common shares outstanding for diluted earnings per common share computation (in shares)	106,589,699	61,747,972	102,935,360	61,732,822
Basic earnings per common share (in dollars per share)	$ 0.80	$ 0.76	$ 1.13	$ 2.29
Diluted earnings per common share (in dollars per share)	$ 0.80	$ 0.76	$ 1.13	$ 2.28
Restricted Stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)	48,871	89,142	51,161	88,677
Unvested restricted stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)			481,567	355,981