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Debt and Credit Arrangements - Interest Expense and Financing Cost Amortization (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Debt Instrument |  |  |  |
Interest expense excluding amortization | $ 2.2 | $ 7.6 | $ 4.2 | $ 14.8
Financing costs amortization | 1.1 | 1.1 | 2.3 | 2.1
Revolving Credit Facility |  |  |  |
Debt Instrument |  |  |  |
Interest expense excluding amortization | 1.8 | 4.6 | 3.1 | 9.4
Financing costs amortization | 0.8 | 0.9 | 1.8 | 1.7
Revolving Credit Facility | Term loan |  |  |  |
Debt Instrument |  |  |  |
Interest expense excluding amortization | 0.5 | 4.0 | 1.1 | 8.2
Revolving Credit Facility | Senior secured revolving credit facility |  |  |  |
Debt Instrument |  |  |  |
Interest expense excluding amortization | $ 1.3 | $ 0.6 | $ 2.0 | $ 1.2

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