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Information on Business Segments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2020 USD ($) customer	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments	3	3
Concentration risk, number of customers | customer			5
Sales Revenue, Net | Staples/Essendant
Segment Reporting Information [Line Items]
Concentration risk, sales					$ 200.2
Concentration risk, percentage	10.00%
Sales Revenue, Net | Top five customers
Segment Reporting Information [Line Items]
Concentration risk, sales				$ 554.7	641.5	$ 577.3
Accounts Receivable | Top five customers
Segment Reporting Information [Line Items]
Concentration risk, trade account receivable	$ 118.2	$ 118.2	$ 118.2	$ 118.2	$ 112.9

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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