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Fair Value Measurements - Estimated Fair Values of Debt Instruments (Details) - Senior Notes - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Fair Value Disclosures [Line Items]
Total fair value of outstanding senior convertible notes	$ 2,340.0	$ 2,286.0
Senior Convertible Notes due 2025
Fair Value Disclosures [Line Items]
Total fair value of outstanding senior convertible notes	1,199.6	1,163.7
Senior Convertible Notes due 2028
Fair Value Disclosures [Line Items]
Total fair value of outstanding senior convertible notes	$ 1,140.4	$ 1,122.3

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[Line Items] for Fair Value Disclosures [Table]

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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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-Topic 820
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-Section 50
-Paragraph 2E
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

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