Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Other Comprehensive Income [Abstract]
Net Income	$ 37.4	$ 20.5	$ 23.5
Defined benefit pension plans:
Net gain (loss) / prior service credit (cost)	22.4	(6.0)	(19.4)
Amortization of net loss included in net periodic pension cost	7.7	8.0	5.2
Amortization of prior service credit (cost) included in net periodic pension cost	(1.3)	(1.3)	0.6
Income taxes related to other comprehensive income	(11.7)	(0.3)	5.2
Other Comprehensive Income	17.1	0.4	(8.4)
Comprehensive Income	54.5	20.9	15.1
Comprehensive income attributable to noncontrolling interest	(0.5)	0	0
Comprehensive income attributable to A&B	$ 54.0	$ 20.9	$ 15.1