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Debt - 2023 Warrants (Details) - Senior Convertible Notes due 2023 - Senior Notes $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended
	Nov. 30, 2018 USD ($) d $ / shares shares
Debt Instrument [Line Items]
Stock counterparties to acquire with warrants purchased (in shares) | shares	20.7
Number of trading days | d	60
Proceeds from sale of warrants | $	$ 183.8
Exercise price of warrants or rights (in usd per share) | $ / shares	$ 49.60

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Exercise price per share or per unit of warrants or rights outstanding.

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