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Lines of Credit and Financing Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Outstanding debt obligations | The following tables summarize our outstanding debt obligations and their classification in the accompanying Consolidated Balance Sheets (in millions):
| As of December 31,
| 2020 |  | 2019
Current maturities of long-term debt: |  |  |
Asset securitization program | $ | — |  |  | $ | 285.0 |
Finance lease obligations | 10.1 |  |  | 7.8 |
Domestic credit facility | — |  |  | 30.0 |
Debt issuance costs | (0.2) |  |  | (0.9) |
Total current maturities of long-term debt | $ | 9.9 |  |  | $ | 321.9 |
Long-Term Debt: |  |  |
Finance lease obligations | 29.3 |  |  | 25.9 |
Domestic credit facility | — |  |  | 475.5 |
Senior unsecured notes | 950.0 |  |  | 350.0 |
Debt issuance costs | (8.6) |  |  | (2.1) |
Total long-term debt | $ | 970.7 |  |  | $ | 849.3 |
Total debt | $ | 980.6 |  |  | $ | 1,171.2 |
Aggregate amounts of required principal payments on total debt | As of December 31, 2020, the aggregate amounts of required principal payments on total debt excluding finance lease obligations (see Note 5) were as follows (in millions):
2021 | $ | — |
2022 | — |
2023 | 350.0 |
2024 | — |
2025 | 300.0 |
Thereafter | 300.0 |
Eligible amounts available and beneficial interests sold | The eligible amounts available and beneficial interests sold were as follows (in millions):
| As of December 31,
| 2020 |  | 2019
Eligible amount available under the ASP on qualified accounts receivable | $ | 279.1 |  |  | $ | 320.0 |
Less: Beneficial interest transferred | — |  |  | (285.0) |
Remaining amount available | $ | 279.1 |  |  | $ | 35.0 |
Summary of weighted average borrowing rate facility | Our weighted average borrowing rate on the facility was 0% as of December 31, 2020 as there were no outstanding borrowings. Below is a summary of the weighted average interest rate for both December 31, 2020 and 2019:
| As of December 31,
| 2020 |  | 2019
Weighted average borrowing rate | — | % |  | 2.93 | %
Required ratios under the domestic credit facility | The required ratios under our Domestic Credit Facility are detailed below:
Consolidated Indebtedness to Adjusted EBITDA Ratio no greater than | 3.5 : 1.0
Cash Flow to Interest Expense Ratio no less than | 3.0 : 1.0

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