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Debt - 2023 Note Hedge (Details) - Senior Convertible Notes due 2023 - Senior Notes $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended
	Nov. 30, 2018 USD ($) $ / shares shares
Debt Instrument [Line Items]
Conversion price of convertible notes (in usd per share) | $ / shares	$ 41.07
Designated as Hedging Instrument
Debt Instrument [Line Items]
Stock issued upon conversion of senior notes (in shares) | shares	20.7
Equity component of 2025 Notes issuance, net of issuance costs | $	$ 218.9

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Debt Instrument, Convertible, Associated Derivative Transactions, Number Of Shares1

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Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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The price per share of the conversion feature embedded in the debt instrument.

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