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Lines of Credit and Financing Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2023
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,
| 2023 |  | 2022
Commercial paper: | $ | 150.0 |  |  | $ | — |
Current maturities of long-term debt: |  |  |
Asset securitization program | $ | — |  |  | $ | 350.0 |
Finance lease obligations | 12.1 |  |  | 11.2 |
Senior unsecured notes | — |  |  | 350.0 |
Debt issuance costs | — |  |  | (0.6) |
Total current maturities of long-term debt | $ | 12.1 |  |  | $ | 710.6 |
Long-Term Debt: |  |  |
Finance lease obligations | 32.7 |  |  | 28.3 |
Credit agreement | 20.0 |  |  | 192.0 |
Senior unsecured notes | 1,100.0 |  |  | 600.0 |
Debt issuance costs | (9.6) |  |  | (6.1) |
Total long-term debt | $ | 1,143.1 |  |  | $ | 814.2 |
Total debt | $ | 1,305.2 |  |  | $ | 1,524.8 |
Aggregate amounts of required principal payments on total debt | As of December 31, 2023, the aggregate amounts of required principal payments on total debt excluding finance lease obligations (see Note 5) were as follows (in millions):
2024 | $ | 150.0 |
2025 | 300.0 |
2026 | 20.0 |
2027 | 300.0 |
2028 | 500.0 |
Thereafter | — |
Summary of weighted average borrowing rate facility | Below is a summary of the weighted average interest rate for CP notes as of December 31, 2023 and 2022:
| As of December 31,
| 2023 |  | 2022
Weighted average borrowing rate | 5.66 | % |  | — | %
Below is a summary of the weighted average interest rate as of December 31, 2023 and 2022:
| As of December 31,
| 2023 |  | 2022
Weighted average borrowing rate | 6.67 | % |  | 5.57 | %

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