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Debt and Credit Arrangements - Notes Interest Accretion Schedule (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Nov. 06, 2017
Debt Instrument |  |  |  |  |
Interest expense excluding amortization | $ 5.7 | $ 3.2 | $ 13.3 | $ 7.4 |
Financing costs amortization | 0.7 | 1.2 | 2.1 | 3.5 |
Convertible Debt | Convertible Notes, due 2024 |  |  |  |  |
Debt Instrument |  |  |  |  |
Interest expense excluding amortization | 0.6 | 0.6 | 1.9 | 1.9 |
Financing costs amortization | 0.2 | $ 0.2 | 0.7 | $ 0.7 |
Debt instrument stated interest rate (percent) |  |  |  |  | 1.00%
Debt issuance costs | $ 6.8 |  | $ 6.8 |  |

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