Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Revenue:
Total operating revenue	$ 77.8	$ 89.1	$ 232.5	$ 327.6
Operating Costs and Expenses:
Cost of Commercial Real Estate	23.5	23.8	71.8	64.3
Selling, general and administrative	11.7	13.3	34.5	45.1
Impairment of assets related to Materials & Construction	0.0	49.7	5.6	49.7
Total operating costs and expenses	78.3	134.7	219.1	354.8
Gain (loss) on disposal of commercial real estate properties, net	0.0	0.0	0.5	0.0
Gain (loss) on disposal of non-core assets, net	9.0	0.0	9.0	0.0
Total gain (loss) on disposal of assets, net	9.0	0.0	9.5	0.0
Operating Income (Loss)	8.5	(45.6)	22.9	(27.2)
Other Income and (Expenses):
Income (loss) related to joint ventures	2.2	2.4	5.3	6.1
Interest and other income (expense), net	(0.4)	0.6	(0.6)	2.8
Interest expense	(7.1)	(8.2)	(22.7)	(25.4)
Income (loss) from continuing operations before income taxes	3.2	(50.8)	4.9	(43.7)
Income tax benefit (expense)	0.0	0.0	0.0	1.1
Income (Loss) from Continuing Operations	3.2	(50.8)	4.9	(42.6)
Income (loss) from discontinued operations, net of income taxes	0.0	(0.1)	(0.8)	(0.8)
Net Income (Loss)	3.2	(50.9)	4.1	(43.4)
Loss (income) attributable to noncontrolling interest	(0.2)	1.1	0.4	1.8
Net Income (Loss) Attributable to A&B Shareholders	$ 3.0	$ (49.8)	$ 4.5	$ (41.6)
Earnings (Loss) Per Share Available to A&B Shareholders:
Continuing operations available to A&B shareholders (in dollars per share)	$ 0.04	$ (0.69)	$ 0.07	$ (0.57)
Discontinued operations available to A&B shareholders (in dollars per share)	0	0	(0.01)	(0.01)
Net income (loss) available to A&B shareholders (in dollars per share)	0.04	(0.69)	0.06	(0.58)
Diluted Earnings (Loss) Per Share of Common Stock:
Continuing operations available to A&B shareholders (in dollars per share)	0.04	(0.69)	0.07	(0.57)
Discontinued operations available to A&B shareholders (in dollars per share)	0	0	(0.01)	(0.01)
Net income (loss) available to A&B shareholders (in dollars per share)	$ 0.04	$ (0.69)	$ 0.06	$ (0.58)
Weighted-Average Number of Shares Outstanding:
Basic (in shares)	72.4	72.3	72.3	72.2
Diluted (in shares)	72.4	72.3	72.4	72.2
Amounts Available to A&B Common Shareholders (Note 17):
Continuing operations available to A&B common shareholders	$ 3.0	$ (49.7)	$ 5.3	$ (40.8)
Discontinued operations available to A&B common shareholders	0.0	(0.1)	(0.8)	(0.8)
Net income (loss) available to A&B common shareholders	3.0	(49.8)	4.5	(41.6)
Commercial Real Estate
Operating Revenue:
Commercial real estate	35.7	42.7	113.1	118.6
Land Operations
Operating Revenue:
Revenues	7.7	8.5	29.0	82.4
Operating Costs and Expenses:
Operating costs	12.9	5.9	23.8	68.5
Materials & Construction
Operating Revenue:
Revenues	34.4	37.9	90.4	126.6
Operating Costs and Expenses:
Operating costs	$ 30.2	$ 42.0	$ 83.4	$ 127.2