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Fair Value Measurements - Fair Value of Senior Convertible Notes (Details) - Senior Notes - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fair value of outstanding senior convertible notes	$ 2,150.8	$ 1,399.8
Senior convertible notes due 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fair value of outstanding senior convertible notes	890.8	540.2
Senior 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	$ 1,260.0	$ 859.6

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- Definition

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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