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Long-Term Debt and Finance Leases - Summary (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 20, 2021
--- | --- | --- | ---
Long-Term Debt and Capital Leases |  |  |
Available borrowing capacity | $ 0.4 |  |
Long-term debt | 951.4 | $ 912.3 |
Other Financing | 1.1 | 1.4 |
Finance lease obligations | $ 23.6 | $ 24.6 |
Finance Lease, Liability, Statement of Financial Position | Long-term portion, Less current portion | Long-term portion, Less current portion |
Total long-term debt, finance lease obligations and other | $ 976.1 | $ 938.3 |
Debt issuance costs, net | (3.1) | (3.8) |
Sub-total | 973.0 | 934.5 |
Less current portion | (17.9) | (18.8) |
Long-term portion | $ 955.1 | 915.7 |
Term B Loans |  |  |
Long-Term Debt and Capital Leases |  |  |
Effective interest rate (as a percent) | 7.60% |  |
Long-term debt | $ 706.4 | 711.3 |
Debt issuance costs, net | (2.5) | (3.0) |
Net discount | 3.5 | 4.1 |
Revolving Credit Facility |  |  |
Long-Term Debt and Capital Leases |  |  |
Available borrowing capacity | $ 0.4 |  |
Effective interest rate (as a percent) | 7.69% |  |
Long-term debt | $ 245.0 | 201.0 |
Debt issuance costs, net | (0.6) | $ (0.8) |
Maximum borrowing capacity | 250.0 |  | $ 250.0
Outstanding letters of credit | $ 4.6 |  |

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