Earnings (Loss) 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 (Loss) per Common Share
Income (loss) from continuing operations, basic	$ 4.0	$ (22.5)	$ 9.7	$ (45.2)
Income (loss) from continuing operations, diluted	4.0	(22.5)	9.7	(45.2)
Income from discontinued operations, basic		34.9		67.2
Income from discontinued operations, diluted		34.9		67.2
Net income, basic	4.0	12.4	9.7	22.0
Net income, diluted	$ 4.0	$ 12.4	$ 9.7	$ 22.0
Basic weighted-average shares	84,148,917	82,828,227	83,722,315	82,433,311
Effect of dilutive securities
Restricted stock awards	2,644,222		2,920,534
Diluted weighted-average shares	86,793,139	82,828,227	86,642,849	82,433,311
Basic and diluted earnings (loss) per common share - continuing operations
Basic (in dollars per share)	$ 0.05	$ (0.27)	$ 0.12	$ (0.55)
Diluted (in dollars per share)	0.05	(0.27)	0.11	(0.55)
Basic and diluted earnings per common share - discontinued operations
Basic (in dollars per share)		0.42		0.82
Diluted (in dollars per share)		0.42		0.82
Basic and diluted earnings per common share
Basic (in dollars per share)	0.05	0.15	0.12	0.27
Diluted (in dollars per share)	$ 0.05	$ 0.15	$ 0.11	$ 0.27