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v3.20.4

Schedule II - Valuation and Qualifying Accounts and Reserves | 12 Months Ended
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Dec. 31, 2020
Schedule II Valuation and Qualifying Accounts and Reserves |
Schedule II Valuation and Qualifying Accounts and Reserves | ​ Valuation and Qualifying Accounts and Reserves (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Additions
​ |  | Balance at |  | Charged to |  | ​ |  | ​ |  | ​ | ​
​ | ​ | beginning of | ​ | costs and | ​ | ​ | ​ | Deduction/ | ​ | Balance at
​ | ​ | period | ​ | expenses | ​ | Additions | ​ | Application | ​ | end of period
Reserve deducted in balance sheet to which applicable: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accounts Receivable: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2020 |  | $ | 0.5 | ​ | 8.5 | ​ | — | ​ | (0.2) |  | $ | 8.8
2019 |  | $ | 0.5 | ​ | — | ​ | — | ​ | — |  | $ | 0.5
2018 |  | $ | 1.1 | ​ | — |  | — | ​ | (0.6) |  | $ | 0.5
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Notes issued under par: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2020 |  | $ | 69.6 |  | 2.0 |  | — |  | — |  | $ | 67.6
2019 |  | $ | 58.8 |  | 1.9 |  | 12.7 |  | — |  | $ | 69.6
2018 |  | $ | 60.5 |  | 1.7 |  | — |  | — |  | $ | 58.8
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Valuation allowance: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2020 | ​ | $ | 1,097.0 | ​ | 246.2 | ​ | — |  | — | ​ | $ | 1,343.2
2019 | ​ | $ | 819.1 | ​ | 277.9 | ​ | — |  | — | ​ | $ | 1,097.0
2018 | ​ | $ | 619.6 | ​ | 199.5 | ​ | — |  | — | ​ | $ | 819.1

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 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) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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