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Debt and Credit Arrangements - Notes Interest Accretion Schedule (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Nov. 06, 2017
Debt Instrument |  |  |  |  |
Interest expense excluding amortization | $ 4.4 | $ 2.2 | $ 7.6 | $ 4.2 |
Financing costs amortization | 0.7 | 1.1 | 1.4 | 2.3 |
Convertible Debt | Convertible Notes, due 2024 |  |  |  |  |
Debt Instrument |  |  |  |  |
Interest expense excluding amortization | 0.7 | 0.7 | 1.3 | 1.3 |
Financing costs amortization | $ 0.3 | $ 0.3 | $ 0.5 | $ 0.5 |
Debt instrument stated interest rate (percent) |  |  |  |  | 1.00%

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