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Convertible Senior Notes (Tables)

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Schedule of Notes Net of Discount and Deferred Financing Costs

The following table presents a summary of the 2024 Notes as of December 31, 2023.

			Principal Amount						Unamortized Issuance Costs						Net Carrying Amount						Fair Value
(in millions)																					Amount						Leveling
2024 Notes			$	170.4					$	(0.3)					$	170.1					$	295.7					Level 2

The following table presents a summary of the 2024 Notes as of December 31, 2022.

			Principal Amount						Unamortized Issuance Costs						Net Carrying Amount						Fair Value
(in millions)																					Amount						Leveling
2024 Notes			$	170.4					$	(1.0)					$	169.4					$	268.0					Level 2

The following table presents a summary of the interest expense of the 2024 Notes.

			Year Ended December 31,
(in millions)			2023						2022						2021
Coupon interest			$	3.9					$	5.9					$	8.5
Amortization of debt discount and issuance costs			0.7						1.2						17.3
Total interest expense			$	4.6					$	7.1					$	25.8

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- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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