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Debt - Convertible Senior Notes (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) day $ / shares	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes	$ 0.0	$ 1,389.1
Convertible Scenario One
Debt Instrument [Line Items]
Convertible debt, threshold trading days | day	20
Convertible debt, threshold consecutive trading days | day	30
Convertible debt, threshold percentage of stock price trigger	130.00%
Convertible Scenario Two
Debt Instrument [Line Items]
Convertible debt, threshold trading days | day	5
Convertible debt, threshold consecutive trading days | day	5
Convertible debt, threshold percentage of stock price trigger	98.00%
Redemption Scenario
Debt Instrument [Line Items]
Convertible debt, threshold trading days | day	20
Convertible debt, threshold consecutive trading days | day	30
Convertible debt, threshold percentage of stock price trigger	130.00%
Convertible Debt | Redemption Scenario
Debt Instrument [Line Items]
Convertible debt, redemption percentage	100.00%
Convertible Debt | Fundamental Change
Debt Instrument [Line Items]
Convertible debt, redemption percentage	100.00%
2026 Notes
Debt Instrument [Line Items]
Convertible debt, conversion rate	0.0261458
Convertible debt, conversion rate (in dollars per share) | $ / shares	$ 38.25
Interest expense	$ 0.5	0.2
2026 Notes | Maximum
Debt Instrument [Line Items]
Convertible debt, conversion rate	0.0431406
2026 Notes | Convertible Debt
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes		695.8
Debt issuance costs	$ 11.0
Debt instrument, term	5 years
Effective interest rate	0.32%
2028 Notes
Debt Instrument [Line Items]
Convertible debt, conversion rate	0.0282889
Convertible debt, conversion rate (in dollars per share) | $ / shares	$ 35.35
Interest expense	$ 0.4	0.2
2028 Notes | Maximum
Debt Instrument [Line Items]
Convertible debt, conversion rate	0.0431406
2028 Notes | Convertible Debt
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes		$ 693.3
Debt issuance costs	$ 11.0
Debt instrument, term	7 years
Effective interest rate	0.22%

X

- Definition

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

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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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 accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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