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Fair Value Measurements - Schedule of Carrying Amounts and Estimated Fair Values (Details) $ in Millions	Mar. 31, 2021 USD ($)
Net Carrying Amount | 2025 Convertible Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Convertible senior notes	$ 150.3
Net Carrying Amount | 2028 Convertible Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Convertible senior notes	185.8
Estimated Fair Value | 2025 Convertible Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Convertible senior notes	186.1
Estimated Fair Value | 2028 Convertible Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Convertible senior notes	$ 286.4

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Fair value portion of notes payable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16(a))
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-SubTopic 210
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