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Fair Value Measurements - Estimated Fair Values of Debt Instruments (Details) - Senior Notes - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Fair Value Disclosures [Line Items]
Fair value of outstanding senior convertible notes:	$ 2,531.2	$ 3,451.1
Senior Convertible Notes due 2023
Fair Value Disclosures [Line Items]
Fair value of outstanding senior convertible notes:	281.3	2,136.2
Senior Convertible Notes due 2025
Fair Value Disclosures [Line Items]
Fair value of outstanding senior convertible notes:	1,140.5	1,314.9
Senior Convertible Notes due 2028
Fair Value Disclosures [Line Items]
Fair value of outstanding senior convertible notes:	$ 1,109.4	$ 0.0

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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.

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