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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts Receivable |  |  |
Valuation and Qualifying Accounts and Reserves |  |  |
Balance at beginning of period | $ 0.5 | $ 0.5 | $ 1.1
Charged to costs and expenses | 8.5 |  |
Deductions/Applications | (0.2) |  | (0.6)
Balance at end of period | 8.8 | 0.5 | 0.5
Notes issued under par |  |  |
Valuation and Qualifying Accounts and Reserves |  |  |
Balance at beginning of period | 69.6 | 58.8 | 60.5
Charged to costs and expenses | 2.0 | 1.9 | 1.7
Additions |  | 12.7 |
Balance at end of period | 67.6 | 69.6 | 58.8
Valuation allowance |  |  |
Valuation and Qualifying Accounts and Reserves |  |  |
Balance at beginning of period | 1,097.0 | 819.1 | 619.6
Charged to costs and expenses | 246.2 | 277.9 | 199.5
Balance at end of period | $ 1,343.2 | $ 1,097.0 | $ 819.1

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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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