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Debt - Carrying Amount of Liability Component of Notes (Detail) $ in Millions	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Principal amount	$ 1,238.0
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount	575.0
Convertible Senior Notes [Member] | Liability Component [Member]
Debt Instrument [Line Items]
Principal amount	575.0
Less:
Less unamortized discount on Term Debt and Convertible Senior Notes	107.9
Unamortized debt issuance costs	11.5
Net carrying amount	$ 455.6

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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