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Debt and Credit Arrangements - Interest Expense and Financing Cost Amortization (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument |  |  |  |
Interest expense excluding amortization | $ 3.2 | $ 6.5 | $ 7.4 | $ 21.2
Financing costs amortization | 1.2 | 1.1 | 3.5 | 3.2
Revolving Credit Facility |  |  |  |
Debt Instrument |  |  |  |
Interest expense excluding amortization | 2.9 | 3.8 | 6.0 | 13.2
Financing costs amortization | 1.0 | 0.9 | 2.8 | 2.6
Revolving Credit Facility | Term loan |  |  |  |
Debt Instrument |  |  |  |
Interest expense excluding amortization | 1.3 | 3.4 | 2.4 | 11.6
Revolving Credit Facility | Senior secured revolving credit facility |  |  |  |
Debt Instrument |  |  |  |
Interest expense excluding amortization | $ 1.6 | $ 0.4 | $ 3.6 | $ 1.6

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