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Earnings Per Share (“EPS”) - Schedule of Reconciliation of Income from Continuing Operations and Computation of Earnings per Share (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Earnings Per Share [Abstract] |  |
Income (loss) from continuing operations | $ 5.8 | $ 9.5
Exclude: (Income) loss attributable to noncontrolling interest | 0.6 | 0.3
Income (loss) from continuing operations attributable to A&B shareholders | 6.4 | 9.8
Distributions and allocations to participating securities | 0.0 | 0.0
Income (loss) from continuing operations available to A&B common shareholders | 6.4 | 9.8
Income (loss) from discontinued operations available to A&B common shareholders | (0.2) | (0.8)
Net income (loss) available to A&B common shareholders | $ 6.2 | $ 9.0
Number of shares used to compute basic and diluted earnings per share [Abstract] |  |
Denominator for basic EPS – weighted-average shares outstanding (in shares) | 72.3 | 72.1
Effect of dilutive securities: |  |
Non-participating stock options and restricted stock unit awards (in shares) | 0.2 | 0.4
Denominator for diluted EPS – weighted average shares outstanding (in shares) | 72.5 | 72.5

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