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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 | 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

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