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Lines of Credit and Financing Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Outstanding debt obligations | The following tables summarize our outstanding debt obligations and the classification in the accompanying Consolidated Balance Sheets (in millions):
| As of December 31,
| 2017 |  | 2016
Short-Term Debt: |  |  |
Asset Securitization Program | $ | — |  |  | $ | 50.0 |
Foreign obligations | 0.9 |  |  | 2.4 |
Total short-term debt | $ | 0.9 |  |  | $ | 52.4 |
Current maturities of long-term debt: |  |  |
Capital lease obligations | $ | 3.2 |  |  | $ | 0.8 |
Domestic credit facility | 30.0 |  |  | — |
Senior unsecured notes | — |  |  | 200.0 |
Debt issuance costs | (0.6 | ) |  | (0.7 | )
Total current maturities of long-term debt | $ | 32.6 |  |  | $ | 200.1 |
Long-Term Debt: |  |  |
Asset Securitization Program | $ | 276.0 |  |  | $ | — |
Capital lease obligations | 11.9 |  |  | 15.0 |
Domestic credit facility | 337.0 |  |  | 256.0 |
Senior unsecured notes | 350.0 |  |  | 350.0 |
Debt issuance costs | (4.4 | ) |  | (5.3 | )
Total long-term debt | $ | 970.5 |  |  | $ | 615.7 |
Total debt | $ | 1,004.0 |  |  | $ | 868.2 |
Aggregate amounts of required principal payments on total debt | As of December 31, 2017, the aggregate amounts of required principal payments on total debt were as follows (in millions):
2018 | $ | 34.1 |
2019 | 306.3 |
2020 | 30.0 |
2021 | 277.0 |
2022 | — |
Thereafter | 361.6 |
Eligible amounts available and beneficial interests sold | The eligible amounts available and beneficial interests sold were as follows (in millions):
| As of December 31,
| 2017 |  | 2016
Eligible amount available under the ASP on qualified accounts receivable | $ | 290.0 |  |  | $ | 250.0 |
Beneficial interest sold | (276.0 | ) |  | (50.0 | )
Remaining amount available | $ | 14.0 |  |  | $ | 200.0 |
Summary of weighted average borrowing rate facility | Our weighted average borrowing rate on the facility was as follows:
| As of December 31,
| 2017 |  | 2016
Weighted average borrowing rate | 2.76 | % |  | 2.00 | %
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 Net Interest Expense Ratio no less than | 3.0 : 1.0

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