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Note 7 - Goodwill and Intangible Assets - Balances of Acquired Intangible Assets, Excluding Goodwill (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Original cost	$ 210.3	$ 218.5
Accumulated amortization	(99.2)	(92.3)
Carrying value	111.1	126.2
Customer Lists [Member]
Original cost	161.1	166.2
Accumulated amortization	(75.9)	(70.3)
Carrying value	$ 85.2	$ 95.9
Weighted average original life (in years) (Year)	15 years	15 years
Trade Names [Member]
Original cost	$ 31.6	$ 34.4
Accumulated amortization	(13.0)	(12.3)
Carrying value	$ 18.6	$ 22.1
Weighted average original life (in years) (Year)	10 years	11 years
Technology-Based Intangible Assets [Member]
Original cost	$ 17.6	$ 17.9
Accumulated amortization	(10.3)	(9.7)
Carrying value	$ 7.3	$ 8.2
Weighted average original life (in years) (Year)	11 years	11 years

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

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