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Convertible Senior Notes (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Convertible senior notes net of discounts and deferred financing costs

The 2024 Notes, net of discounts and deferred financing costs, consisted of the following:

			December 31,
(in millions)			2021						2020
Principal			$	381.2					$	381.3
Deferred financing costs			(2.9)						(4.0)
Debt discount, net			(43.2)						(59.4)
Net carrying amount			$	335.1					$	317.9

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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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