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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Information on Business Segments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) customer	Dec. 31, 2017 USD ($)	Dec. 31, 2016 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	$ 577.3	$ 615.1	$ 663.5
Sales Revenue, Net \| Staples
Segment Reporting Information [Line Items]
Concentration risk, sales			$ 210.5
Concentration risk, percentage			14.00%
Sales Revenue, Net \| Wal-Mart
Segment Reporting Information [Line Items]
Concentration risk, sales			$ 161.7
Concentration risk, percentage			10.00%
Accounts Receivable \| Top five customers
Segment Reporting Information [Line Items]
Concentration risk, trade account receivable	$ 125.0	$ 148.4