Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share, Basic and Diluted [Line Items]
Net income	$ 64.1	$ 42.5	$ 30.7	$ 93.9
Weighted average common shares outstanding for basic earnings per share computation (in shares)	109,106,891	61,657,593	101,025,926	61,624,917
Dilutive effects of stock-based compensation (in shares)	24,827	70,228	50,405	98,225
Weighted average common shares outstanding for diluted earnings per common share computation (in shares)	109,131,718	61,727,821	101,076,331	61,723,142
Basic earnings per common share (in dollars per share)	$ 0.59	$ 0.69	$ 0.30	$ 1.52
Diluted earnings per common share (in dollars per share)	$ 0.59	$ 0.69	$ 0.30	$ 1.52
Restricted Stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)	218,033	84,165	61,058	90,538
Unvested restricted stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)			500,573	363,960