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Information on Business Segments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) customer	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments	3
Concentration risk, number of customers | customer	5
Sales Revenue, Net | Top five customers
Segment Reporting Information [Line Items]
Concentration risk, sales	$ 641.5	$ 577.3	$ 615.1
Sales Revenue, Net | Staples/Essendant
Segment Reporting Information [Line Items]
Concentration risk, sales	$ 200.2
Concentration risk, percentage	10.00%
Accounts Receivable | Top five customers
Segment Reporting Information [Line Items]
Concentration risk, trade account receivable	$ 112.9	$ 125.0

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- Definition

Concentration Risk, Number of Customers

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Concentration Risk, Revenue

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Concentration Risk, Trade Account Receivable

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- Definition

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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