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Note 2 - Newly Adopted Accounting Pronouncements - Reconciliation of Allowance for Doubtful Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Balance at beginning of year |  | $ 3.6 | $ 2.5 | $ 2.4
Charged to costs and expenses |  | 2.2 | 2.5 | 0.4
Reclassification(1) | [1] | 0.0 | 0.5 | 0.8
Charged to other accounts(2) | [2] | 0.0 | 0.0 | (0.2)
Deductions(3) | [3] | (1.2) | (1.9) | (0.9)
Balance at end of year |  | $ 4.6 | $ 3.6 | $ 2.5
[1] | Includes amount reclassified between Allowance for Doubtful Accounts and Other Receivables related to a customer's open receivables balance for proper classification and acquisition-related adjustments.
[2] | Primarily includes impact from foreign currency fluctuations.
[3] | Includes accounts determined to be uncollectible and charged against reserves, net of collections on accounts previously charged against reserves.

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to accounts other than cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column C)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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