Information on Business Segments (Identifiable Intangibles and Goodwill by Segment) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill		$ 2,799.1	$ 2,064.5
Operating Segments
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill		2,550.0	1,984.5
Unallocated Assets
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill		248.3	79.2
Corporate
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill	[1]	0.8	0.8
ACCO Brands North America | Operating Segments
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill	[1]	1,204.3	1,206.8
ACCO Brands EMEA | Operating Segments
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill	[1]	711.7	155.2
ACCO Brands International | Operating Segments
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill	[1]	$ 634.0	$ 622.5

[1] Represents total assets, excluding: intercompany balances, cash, deferred taxes, derivatives, prepaid pension assets and prepaid debt issuance costs.