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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
	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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Amount, before tax, of income (loss) attributable to noncontrolling interest. Includes, but is not limited to, income (loss) from continuing operations, discontinued operations and equity method investments.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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