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Convertible Senior Notes (Tables)

12 Months Ended

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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- 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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