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Convertible Senior Notes, Net of Discounts and Deferred Financing Costs (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
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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- Definition

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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Face (par) amount of debt instrument at time of issuance.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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