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Financing Arrangements (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Financing Arrangements. |
Schedule of long-term debt | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2021 |  | 2020
​ | ​ | (in millions)
Line of Credit due March 2026 | ​ | $ | 145.0 | ​ |  | —
Line of Credit due February 2022 | ​ | ​ | — | ​ |  | 200.0
Less debt issuance costs (deduction from debt liability) | ​ |  | (3.1) | ​ |  | (1.8)
Total long-term debt | ​ | $ | 141.9 | ​ | $ | 198.2

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