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Schedule II-Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts Receivable Reserve Allowances |  |  |
Changes in valuation and qualifying accounts |  |  |
Balance At Beginning of Period | $ 14.3 | $ 15.0 | $ 14.3
Additions Charged To Expense | 1.1 | 2.2 | 3.3
Additions Charged To Other Accounts | 0.9 |  | (0.2)
Deductions | (5.2) | (2.9) | (2.4)
Balance At End of Period | 11.1 | 14.3 | 15.0
Reserve for excess and obsolete inventories |  |  |
Changes in valuation and qualifying accounts |  |  |
Balance At Beginning of Period | 25.0 | 24.4 | 25.4
Additions Charged To Expense | 13.3 | 6.6 | 7.7
Additions Charged To Other Accounts | 1.4 | (0.1) | (0.7)
Deductions | (6.3) | (5.9) | (8.0)
Balance At End of Period | $ 33.4 | $ 25.0 | $ 24.4

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- Definition Amount of valuation and qualifying accounts and reserves. + 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 B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: 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 E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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