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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income from continuing operations $ 23.2 $ 24.1 $ 49.8 $ 47.7
Less: Distributed net income available to participating securities 0.0 0.0 (0.1) (0.3)
Less: Undistributed net income available to participating securities (0.1) (0.1) (0.1) 0.0
Numerator for basic net income per share:        
Undistributed and distributed net (loss) income available to common shareholders 23.1 24.0 49.6 47.4
Add: Undistributed net income allocated to participating securities 0.1 0.1 0.1 (0.0)
Less: Undistributed net income reallocated to participating securities (0.1) (0.1) (0.1) 0.0
Numerator for diluted net income per share:        
Undistributed and distributed net (loss) income available to common shareholders $ 23.1 $ 24.0 $ 49.6 $ 47.4
Denominator:        
Weighted average shares outstanding for basic net income per share (in shares) 37.8 37.5 37.7 37.6
Effect of dilutive securities (in shares) 0.2 0.1 0.2 0.1
Weighted average shares outstanding for diluted net income per share (in shares) 38.0 37.6 37.9 37.7
Net income per share from continuing operations:        
Basic (in dollars per share) $ 0.61 $ 0.64 $ 1.31 $ 1.26
Diluted (in dollars per share) 0.61 0.64 1.31 1.26
Net (loss) income per share from discontinued operations:        
Basic (in dollars per share) (0.00) 0.01 0.28 0.04
Diluted (in dollars per share) (0.00) 0.01 0.28 0.04
Net income per share - Basic (in dollars per share) 0.61 0.65 1.59 1.30
Net income per share - Diluted (in dollars per share) $ 0.61 $ 0.65 $ 1.59 $ 1.30
Potentially dilutive securities (in shares) 0.1 0.5 0.1 0.5
Discontinued Operations        
Numerator for basic net income per share:        
Undistributed and distributed net (loss) income available to common shareholders $ (0.1) $ 0.5 $ 10.4 $ 1.5
Numerator for diluted net income per share:        
Undistributed and distributed net (loss) income available to common shareholders (0.1) 0.5 10.4 1.5
Net (loss) income per common share from discontinued operations:        
Net (loss) income from discontinued operations (0.1) 0.5 10.5 1.5
Less: Undistributed net income available to participating securities (0.0) (0.0) (0.1) (0.0)
Numerator for basic net income per share:        
Add: Undistributed net income allocated to participating securities 0.0 0.0 0.1 0.0
Less: Undistributed net income reallocated to participating securities $ 0.0 $ 0.0 $ (0.1) $ 0.0