Information on Business Segments (Assets by Segment) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets		$ 2,799.1	$ 2,064.5
Operating Segments
Segment Reporting Information [Line Items]
Assets		1,039.7	831.7
Unallocated Assets
Segment Reporting Information [Line Items]
Assets		1,758.6	1,232.0
Corporate
Segment Reporting Information [Line Items]
Assets	[1]	0.8	0.8
ACCO Brands North America | Operating Segments
Segment Reporting Information [Line Items]
Assets	[1]	413.9	404.3
ACCO Brands EMEA | Operating Segments
Segment Reporting Information [Line Items]
Assets	[1]	287.6	104.0
ACCO Brands International | Operating Segments
Segment Reporting Information [Line Items]
Assets	[1]	$ 338.2	$ 323.4

[1] Represents total assets, excluding: goodwill and identifiable intangibles resulting from business acquisitions, intercompany balances, cash, deferred taxes, derivatives, prepaid pension assets and prepaid debt issuance costs.