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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounts Receivable |  |  |
Valuation and Qualifying Accounts and Reserves |  |  |
Balance at beginning of period | $ 8.8 | $ 8.7 | $ 8.8
Charged to costs and expenses | 0.1 | 0.1 |
Deductions/Applications | (0.2) |  | (0.1)
Balance at end of period | 8.7 | 8.8 | 8.7
Notes issued under par |  |  |
Valuation and Qualifying Accounts and Reserves |  |  |
Balance at beginning of period | 63.4 | 65.6 | 67.6
Charged to costs and expenses | 2.1 | 2.2 | 2.0
Balance at end of period | 61.3 | 63.4 | 65.6
Valuation allowance |  |  |
Valuation and Qualifying Accounts and Reserves |  |  |
Balance at beginning of period | 2,053.7 | 1,820.0 | 1,343.2
Charged to costs and expenses | 248.0 | 233.7 | 476.8
Balance at end of period | $ 2,301.7 | $ 2,053.7 | $ 1,820.0

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