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Lines of Credit and Financing Arrangements (Outstanding Debt Obligations) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Commercial paper | $ 150.0 | $ 0.0
Current maturities of long-term debt: |  |
Finance lease obligations | 12.1 | 11.2
Senior unsecured notes | 12.1 | 710.6
Long-Term Debt: |  |
Finance lease obligations | 32.7 | 28.3
Total long-term debt | 1,143.1 | 814.2
Debt Issuance Cost, Gross, Noncurrent | (9.6) | (6.1)
Total debt | 1,305.2 | 1,524.8
Domestic Credit Facility [Member] |  |
Current maturities of long-term debt: |  |
Debt issuance costs | 0.0 | (0.6)
Senior unsecured notes | 0.0 | 350.0
Long-Term Debt: |  |
Total long-term debt | 20.0 | 192.0
Asset Securitization [Member] |  |
Current maturities of long-term debt: |  |
Asset securitization program | 0.0 | 350.0
Senior Unsecured Notes [Member] |  |
Long-Term Debt: |  |
Total long-term debt | $ 1,100.0 | $ 600.0

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