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Schedule II Valuation and Qualifying Accounts and Reserves | 12 Months Ended
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Dec. 31, 2023
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: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2023 |  | $ | 8.8 | ​ | 0.1 | ​ | — | ​ | (0.2) |  | $ | 8.7
2022 |  | $ | 8.7 | ​ | 0.1 | ​ | — | ​ | — |  | $ | 8.8
2021 |  | $ | 8.8 | ​ | — | ​ | — | ​ | (0.1) |  | $ | 8.7
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Notes issued under par: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2023 |  | $ | 63.4 | ​ | 2.1 | ​ | — | ​ | — |  | $ | 61.3
2022 |  | $ | 65.6 | ​ | 2.2 | ​ | — | ​ | — |  | $ | 63.4
2021 |  | $ | 67.6 |  | 2.0 |  | — |  | — |  | $ | 65.6
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Valuation allowance: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2023 | ​ | $ | 2,053.7 | ​ | 248.0 | ​ | — |  | — | ​ | $ | 2,301.7
2022 | ​ | $ | 1,820.0 | ​ | 233.7 | ​ | — |  | — | ​ | $ | 2,053.7
2021 | ​ | $ | 1,343.2 | ​ | 476.8 | ​ | — |  | — | ​ | $ | 1,820.0
​

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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 -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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- References No definition available. + Details
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