Information on Business Segments (Assets by Segment) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Assets		$ 2,786.4	$ 2,799.1
Operating Segments
Segment Reporting Information [Line Items]
Assets		1,074.1	1,039.7
Unallocated Assets
Segment Reporting Information [Line Items]
Assets		1,711.0	1,758.6
Corporate
Segment Reporting Information [Line Items]
Assets	[1]	1.3	0.8
ACCO Brands North America | Operating Segments
Segment Reporting Information [Line Items]
Assets	[1]	456.1	413.9
ACCO Brands EMEA | Operating Segments
Segment Reporting Information [Line Items]
Assets	[1]	276.7	287.6
ACCO Brands International | Operating Segments
Segment Reporting Information [Line Items]
Assets	[1]	$ 341.3	$ 338.2

[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.