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Financing Arrangements - Long-term debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Financing Arrangements |  |
Less debt issuance costs (deduction from liability) | $ (3.1) | $ (1.8)
Total long-term debt | 141.9 | 198.2
Principal payments during each of the next five years and thereafter |  |
2022 | 0.0 |
2023 | 0.0 |
2024 | 0.0 |
2025 | 0.0 |
2026 | 145.0 |
Line Of Credit Maturities On March 2026 |  |
Financing Arrangements |  |
Total debt | $ 145.0 |
Line of Credit matures February 2022 |  |
Financing Arrangements |  |
Total debt |  | 200.0
Letters of credit |  |
Financing Arrangements |  |
Term of letters of credit from the date of issuance | 1 year |
Principal payments during each of the next five years and thereafter |  |
Letters of credit outstanding | $ 14.0 | $ 16.2

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