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Fair Value Measurements Fair Value of Convertible Senior Notes (Details) - Senior Notes - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Line Items]
Fair value of outstanding senior convertible notes:	$ 1,632.1	$ 1,399.8
Senior convertible notes due 2022
Fair Value Disclosures [Line Items]
Fair value of outstanding senior convertible notes:	635.6	540.2
Senior convertible notes due 2023
Fair Value Disclosures [Line Items]
Fair value of outstanding senior convertible notes:	$ 996.5	$ 859.6

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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.

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