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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income from continuing operations	$ 15.3	$ 14.9	$ 23.6	$ 24.9
Less: Distributed net income available to participating securities	0.0	0.0	(0.3)	0.0
Less: Undistributed net income available to participating securities	(0.1)	(0.1)	(0.0)	(0.1)
Numerator for basic net income per share:
Undistributed and distributed net income available to common shareholders	15.2	14.8	23.3	24.8
Add: Undistributed net income allocated to participating securities	0.1	0.1	0.0	0.1
Less: Undistributed net income reallocated to participating securities	(0.1)	(0.1)	0.0	0.0
Numerator for diluted net income per share:
Undistributed and distributed net income available to common shareholders	$ 15.2	$ 14.8	$ 23.3	$ 24.9
Weighted average shares outstanding for basic net income per share (shares)	37.5	37.5	37.6	37.4
Effect of dilutive securities (shares)	0.1	0.4	0.2	0.5
Weighted average shares outstanding for diluted net income per share (shares)	37.6	37.9	37.8	37.9
Net income per share from continuing operations:
Net income per share from continuing operations, basic (USD per share)	$ 0.41	$ 0.40	$ 0.62	$ 0.66
Net income per share from continuing operations, diluted (USD per share)	$ 0.40	$ 0.39	$ 0.62	$ 0.66
Net income (loss) from discontinued operations	$ 1.1	$ (0.3)	$ 1.0	$ (0.6)
Net income (loss) per share from discontinued operations:
Net income per share from discontinued operations, basic (USD per share)	$ 0.03	$ (0.01)	$ 0.03	$ (0.02)
Net income per share from discontinued operations, diluted (USD per share)	0.03	(0.01)	0.03	(0.02)
Net income per share - Basic (in dollars per share)	0.44	0.39	0.65	0.64
Net income per share - Diluted (in dollars per share)	$ 0.43	$ 0.38	$ 0.65	$ 0.64
Potentially dilutive securities (shares)	0.6	0.2	0.6	0.2