Net Income (Loss) per Common Share - Schedule of Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income from continuing operations	$ 20.7	$ 20.3	$ 55.5	$ 64.7
Less: Distributed net income available to participating securities	0.0	0.0	(0.1)	(0.1)
Less: Undistributed net income available to participating securities	(0.1)	(0.1)	(0.2)	(0.2)
Numerator for basic net income per share:
Undistributed and distributed net income available to common shareholders	20.6	20.2	55.2	64.4
Add: Undistributed net income allocated to participating securities	0.1	0.1	0.2	0.2
Less: Undistributed net income reallocated to participating securities	(0.1)	(0.1)	(0.2)	(0.2)
Numerator for diluted net income per share:
Undistributed and distributed net income available to common shareholders	$ 20.6	$ 20.2	$ 55.2	$ 64.4
Denominator:
Weighted average shares outstanding for basic net income per share (in shares)	38.1	38.0	38.1	38.0
Effect of dilutive securities (in shares)	0.1	0.1	0.1	0.1
Weighted average shares outstanding for diluted net income per share (in shares)	38.2	38.1	38.2	38.1
Net income per share from continuing operations:
Basic (in dollars per share)	$ 0.54	$ 0.53	$ 1.45	$ 1.70
Diluted (in dollars per share)	$ 0.54	$ 0.53	$ 1.44	$ 1.69
Net (loss) income from discontinued operations
Net (loss) income from discontinued operations	$ 0.0	$ (0.1)	$ (0.1)	$ 0.3
Less: Undistributed net income available to participating securities	0.0	0.0	0.0	0.0
Undistributed and distributed net (loss) income available to common shareholders	0.0	(0.1)	(0.1)	0.3
Add: Undistributed net income allocated to participating securities	(0.0)	(0.0)	(0.0)	(0.0)
Less: Undistributed net income reallocated to participating securities	0.0	0.0	0.0	0.0
Undistributed and distributed net (loss) income available to common shareholders	$ 0.0	$ (0.1)	$ (0.1)	$ 0.3
Net (loss) income per share from discontinued operations:
Basic (in dollars per share)	$ 0.00	$ (0.00)	$ (0.00)	$ 0.01
Diluted (in dollars per share)	0.00	(0.00)	(0.00)	0.01
Net income per share - Basic (in dollars per share)	0.54	0.53	1.45	1.71
Net income per share - Diluted (in dollars per share)	$ 0.54	$ 0.53	$ 1.44	$ 1.70
Potentially dilutive securities (in shares)	0.2	0.1	0.2	0.1