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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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Income (loss) from continuing operations $ 6.0 $ (36.9) $ (69.2)
Exclude: (Income) loss attributable to noncontrolling interest 0.4 2.0 (2.2)
Income (loss) from continuing operations attributable to A&B shareholders 6.4 (34.9) (71.4)
Exclude: (Increase) decrease in carrying value of redeemable non-controlling interest 0.0 0.0 0.0
Income (loss) from continuing operations available to A&B shareholders 6.4 (34.9) (71.4)
Distributions and allocations to participating securities (0.1) (0.2) 0.0
Income (loss) from continuing operations available to A&B common shareholders 6.3 (35.1) (71.4)
Income (loss) from discontinued operations available to A&B common shareholders (0.8) (1.5) (0.6)
Net income (loss) available to A&B common shareholders $ 5.5 $ (36.6) $ (72.0)
Effect of dilutive securities:      
Denominator for basic EPS – weighted-average shares outstanding (in shares) 72.3 72.2 70.6
Non-participating stock options and restricted stock unit awards (in shares) 0.1 0.0 0.0
Special Distribution (in shares) 0.0 0.0 0.0
Denominator for diluted EPS – weighted average shares outstanding (in shares) 72.4 72.2 70.6