Pension And Other Retiree Benefits (Net Periodic Benefit Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to defined benefit plans for 2012	$ 19.5		$ 19.5
Contributions by company to date			17.5
Settlement charge	0.7
Reduction of net periodic benefit plan due to decrease in plan participation	0.8		2.4
Amended and Restated ACCO Brands Corporation Supplemental Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Settlement charge			3.3
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.2	0	0.5	0
Interest cost	2.4	2.2	6.6	6.5
Expected return on plan assets	(2.6)	(2.7)	(7.8)	(8.1)
Amortization of prior service cost	0	0	0	0
Amortization of net loss (gain)	1.5	1.0	4.6	3.2
Settlement loss			0.7	0
Total net periodic benefit cost	1.5	0.5	4.6	1.6
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.7	0.5	1.8	1.6
Interest cost	3.7	3.7	10.6	11.1
Expected return on plan assets	(4.2)	(4.0)	(12.0)	(12.0)
Amortization of prior service cost	0	0	0.1	0.1
Amortization of net loss (gain)	0.5	1.0	1.6	2.9
Settlement loss			0	0
Total net periodic benefit cost	0.7	1.2	2.1	3.7
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0	0.2	0.1
Interest cost	0.2	0.2	0.5	0.5
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of net loss (gain)	(0.1)	(0.2)	(0.4)	(0.5)
Settlement loss			0	0
Total net periodic benefit cost	$ 0.2	$ 0	$ 0.3	$ 0.1