Convertible Senior Notes - Convertible Note Hedge and Warrant Transactions (Details) - Convertible Note Hedge and Warrant Transactions $ / shares in Units, shares in Millions, $ in Millions	Apr. 17, 2020 USD ($) $ / shares shares
Convertible Note Hedge and Warrant Transactions
Conversion price \| $ / shares	$ 35.38
Number of securities called by warrants or rights \| shares	16.3
Exercise price of warrants or rights \| $ / shares	$ 52.42
Convertible, conversion price percentage - note hedge	35.00%
Convertible, conversion price percentage - warrants	100.00%
Debt instrument, term	5 years
Deferred tax liability in connection with debt discount	$ 42.7
Deferred tax assets in connection with convertible note hedge transactions	42.8
Additional Paid-In Capital
Convertible Note Hedge and Warrant Transactions
Bond hedges and sale of warrants, net	$ 55.8

Debt Instrument, Bond Hedges and Sale of Warrants, Net

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Debt Instrument, Convertible, Conversion Price, Hedge

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

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from derivative instruments.

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