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Fair Value Measurements - Fair Value of Senior Convertible Notes (Details) - Senior Notes - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fair value of outstanding senior convertible notes	$ 4,022.5	$ 3,155.6
Convertible Notes due 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fair value of outstanding senior convertible notes	2,589.6	1,936.4
Convertible Notes due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fair value of outstanding senior convertible notes	$ 1,432.9	$ 1,219.2

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