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Long-Term Debt - Aggregate Maturities of Long-Term Debt (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
2024 | $ 0.7 |
2025 | 536.7 |
2026 | 0.8 |
2027 | 0.8 |
2028 | 0.9 |
2029 and thereafter | 8.2 |
Subtotal | 548.1 |
Less amounts representing original issue discount and debt issuance costs | 1.6 |
Total debt | 546.5 | $ 559.5
After the effect of the exchange of Old Notes and issuance of New notes and Contran Term Loan |  |
Debt Instrument [Line Items] |  |
2024 | 0.7 |
2025 | 177.2 |
2026 | 0.8 |
2027 | 0.8 |
2028 | 0.9 |
2029 and thereafter | 369.0 |
Subtotal | 549.4 |
Less amounts representing original issue discount and debt issuance costs | 6.1 |
Total debt | $ 543.3 |

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