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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accounts Receivable |  |  |
Valuation and Qualifying Accounts and Reserves |  |  |
Balance at beginning of period | $ 8.7 | $ 8.8 | $ 0.5
Charged to costs and expenses | 0.1 |  | 8.5
Deductions/Applications |  | (0.1) | (0.2)
Balance at end of period | 8.8 | 8.7 | 8.8
Notes issued under par |  |  |
Valuation and Qualifying Accounts and Reserves |  |  |
Balance at beginning of period | 65.6 | 67.6 | 69.6
Charged to costs and expenses | 2.2 | 2.0 | 2.0
Balance at end of period | 63.4 | 65.6 | 67.6
Valuation allowance |  |  |
Valuation and Qualifying Accounts and Reserves |  |  |
Balance at beginning of period | 1,820.0 | 1,343.2 | 1,097.0
Charged to costs and expenses | 233.7 | 476.8 | 246.2
Balance at end of period | $ 2,053.7 | $ 1,820.0 | $ 1,343.2

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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 https://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 https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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