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v3.22.2.2

Convertible Senior Notes (Tables) | 9 Months Ended
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Sep. 30, 2022
Debt Disclosure [Abstract] |
Summary of Notes Net of Discount and Deferred Financing Costs | The following table presents a summary of the 2024 Notes as of September 30, 2022.
| Principal Amount |  | Unamortized Debt |  | Net Carrying Amount |  | Fair Value
(in millions) |  | Discount |  | Issuance Costs |  |  | Amount |  | Leveling
2024 Notes | $ | 170.4 |  |  | $ | — |  |  | $ | (1.2) |  |  | $ | 169.2 |  |  | $ | 238.3 |  |  | 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.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2022 |  | 2021 |  | 2022 |  | 2021
Coupon interest | $ | 1.0 |  |  | $ | 2.2 |  |  | $ | 5.0 |  |  | $ | 6.3 |
Amortization of debt discount and issuance costs | 0.2 |  |  | 4.4 |  |  | 1.0 |  |  | 12.9 |
Total | $ | 1.2 |  |  | $ | 6.6 |  |  | $ | 6.0 |  |  | $ | 19.2 |

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