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Fair Value Measurements - Fair Value of Convertible Senior Notes (Details) - Senior Notes - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value Disclosures [Line Items]
Fair value of outstanding senior convertible notes:	$ 3,431.3	$ 2,150.8
Senior Convertible Notes due 2022
Fair Value Disclosures [Line Items]
Fair value of outstanding senior convertible notes:		890.8
Senior Convertible Notes due 2023
Fair Value Disclosures [Line Items]
Fair value of outstanding senior convertible notes:	2,151.8	$ 1,260.0
Senior Convertible Notes due 2025
Fair Value Disclosures [Line Items]
Fair value of outstanding senior convertible notes:	$ 1,279.5

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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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