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Convertible Senior Notes (Tables) | 12 Months Ended
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Dec. 31, 2022
Debt Disclosure [Abstract] |
Convertible senior notes net of discounts and deferred financing costs | The following table presents a summary of the 2024 Notes as of December 31, 2022.
| Principal Amount |  | Unamortized Debt |  | Net Carrying Amount |  | Fair Value
(in millions) |  | Discount |  | Issuance Costs |  |  | Amount |  | Leveling
2024 Notes | $ | 170.4 |  |  | $ | — |  |  | $ | (1.0) |  |  | $ | 169.4 |  |  | $ | 268.0 |  |  | Level 2
The following table presents a summary of the 2024 Notes as of December 31, 2021.
| Principal Amount |  | Unamortized Debt |  | Net Carrying Amount |  | Fair Value
(in millions) |  | Discount |  | Issuance Costs |  |  | Amount |  | Leveling
2024 Notes | $ | 381.2 |  |  | $ | (43.2) |  |  | $ | (2.9) |  |  | $ | 335.1 |  |  | $ | 464.7 |  |  | Level 2
The following table presents a summary of the interest expense of the 2024 Notes.
| Year Ended December 31,
(in millions) | 2022 |  | 2021 |  | 2020
Coupon interest | $ | 5.9 |  |  | $ | 8.5 |  |  | $ | 11.4 |
Amortization of debt discount and issuance costs | 1.2 |  |  | 17.3 |  |  | 21.4 |
Total | $ | 7.1 |  |  | $ | 25.8 |  |  | $ | 32.8 |

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