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Debt and Credit Arrangements - Notes Interest Accretion Schedule (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Nov. 06, 2017
Debt Instrument |  |  |  |
2024 Notes, 1.0% contractual interest coupon, 1.5% for 2022 | $ 271.9 | $ 28.8 | $ 10.7 |
2024 Notes, financing costs amortization | 17.2 | 2.9 | 8.3 |
Convertible Debt | Convertible notes due November 2024 |  |  |  |
Debt Instrument |  |  |  |
2024 Notes, 1.0% contractual interest coupon, 1.5% for 2022 | 2.4 | 4.0 | 2.6 |
2024 Notes, financing costs amortization | $ 1.0 | $ 0.9 | $ 0.9 |
Debt instrument stated interest rate (percent) | 1.00% | 1.50% |  | 1.00%

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