Earnings Per Share (“EPS”) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Income from continuing operations, net of tax	$ 25.9	$ 1.1
Income attributable to noncontrolling interest	(0.6)	(0.4)
Income from continuing operations attributable to A&B shareholders, net of tax	$ 25.3	$ 0.7
Shares used to compute basic and diluted earnings per share [Abstract]
Denominator for basic EPS - weighted average shares (in shares)	48,800,000	48,700,000
Effect of dilutive securities [Abstract]
Employee/director stock options and restricted stock units (in shares)	500,000	500,000
Denominator for diluted EPS - weighted average shares (in shares)	49,300,000	49,200,000
Anti-dilutive securities excluded from the computation of weighted average dilutive shares outstanding (in shares)	0	0