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Debt and Credit Arrangements - Interest Expense and Financing Cost Amortization (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Line of Credit Facility |  |  |  |
Interest expense, debt |  | $ 11.7 | $ 18.1 | $ 17.7
Financing costs amortization |  | 8.3 | 4.3 | 3.0
Term long due June 2024 |  |  |  |
Line of Credit Facility |  |  |  |
Write off of unamortized debt issuance costs |  | 3.7 |  |
Revolving Credit Facility |  |  |  |
Line of Credit Facility |  |  |  |
Interest expense, debt |  | 9.0 | 7.0 | 5.3
Financing costs amortization |  | 7.4 | 3.6 | 2.0
Revolving Credit Facility | Senior secured revolving credit facilities due 2026 |  |  |  |
Line of Credit Facility |  |  |  |
Interest expense, debt |  | 2.5 | 0.0 | 0.0
Financing costs amortization |  | 0.4 | 0.0 | 0.0
Revolving Credit Facility | Term long due June 2024 |  |  |  |
Line of Credit Facility |  |  |  |
Interest expense, debt |  | 1.8 | 4.8 | 3.1
Financing costs amortization |  | 2.9 | 3.6 | 2.0
Write off of unamortized debt issuance costs |  | 3.8 | 0.0 | 0.0
Revolving Credit Facility | Interest expense, senior secured revolving credit facilities due 2024 |  |  |  |
Line of Credit Facility |  |  |  |
Interest expense, debt |  | 4.7 | 2.2 | 2.2
Revolving Credit Facility | Senior secured revolving credit facility 2024 |  |  |  |
Line of Credit Facility |  |  |  |
Financing costs amortization |  | $ 0.3 | $ 0.0 | $ 0.0
Write off of unamortized debt issuance costs | $ 0.1 |  |  |

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