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NET INCOME PER COMMON SHARE - Schedule of Net Income (loss) per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income from continuing operations | $ 70.7 | $ 78.1 | $ 70.1
Less: Distributed net income available to participating securities | (0.2) | (0.1) | (0.3)
Less: Undistributed net income available to participating securities | (0.2) | (0.2) | (0.0)
Numerator for basic net income per share: |  |  |
Undistributed and distributed net income available to common shareholders | 70.3 | 77.8 | 69.8
Add: Undistributed net income allocated to participating securities | 0.2 | 0.2 | 0.0
Less: Undistributed net income reallocated to participating securities | (0.2) | (0.2) | 0.0
Numerator for diluted net income per share: |  |  |
Undistributed and distributed net income available to common shareholders | $ 70.3 | $ 77.8 | $ 69.8
Denominator: |  |  |
Weighted average shares outstanding for basic net income per share (in shares) | 38.1 | 38.0 | 37.8
Effect of dilutive securities (in shares) | 0.1 | 0.1 | 0.2
Weighted average shares outstanding for diluted net income per share (in shares) | 38.2 | 38.1 | 38.0
Net income per share from continuing operations: |  |  |
Basic (in dollars per share) | $ 1.85 | $ 2.05 | $ 1.85
Diluted (in dollars per share) | $ 1.84 | $ 2.04 | $ 1.84
Net income per common share from discontinued operations: |  |  |
Less: Distributed net income available to participating securities | $ (0.2) | $ (0.1) | $ (0.3)
Numerator for diluted net income per share: |  |  |
Undistributed and distributed net income available to common shareholders | $ 70.3 | $ 77.8 | $ 69.8
Net income per share from discontinued operations: |  |  |
Basic (in dollars per share) | $ 0.00 | $ 0.02 | $ 0.88
Diluted (in dollars per share) | 0.00 | 0.02 | 0.87
Net income per share - Basic (in dollars per share) | 1.85 | 2.07 | 2.73
Net income per share - Diluted (in dollars per share) | $ 1.84 | $ 2.06 | $ 2.71
Potentially dilutive securities (in shares) | 0.2 | 0.1 | 0.1
Discontinued operations |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Less: Distributed net income available to participating securities | $ 0.0 | $ 0.0 | $ 0.0
Numerator for diluted net income per share: |  |  |
Undistributed and distributed net income available to common shareholders | 0.0 | 0.7 | 33.0
Net income per common share from discontinued operations: |  |  |
Net income from discontinued operations | 0.0 | 0.7 | 33.2
Less: Distributed net income available to participating securities | 0.0 | 0.0 | 0.0
Less: Undistributed net income available to participating securities | 0.0 | 0.0 | (0.2)
Numerator for basic net income per share: |  |  |
Undistributed and distributed net income available to common shareholders | 0.0 | 0.7 | 33.0
Add: Undistributed net income allocated to participating securities | (0.0) | (0.0) | 0.2
Less: Undistributed net income reallocated to participating securities | 0.0 | 0.0 | (0.2)
Numerator for diluted net income per share: |  |  |
Undistributed and distributed net income available to common shareholders | $ 0.0 | $ 0.7 | $ 33.0

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