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- Definition

Treasury Shares Acquired, Estimated, Prepaid Forward

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Net loss per share Additional Information (Details) $ in Millions			12 Months Ended
	Nov. 24, 2020 USD ($) shares	Apr. 12, 2017 USD ($) shares	Dec. 31, 2020 shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Treasury Shares Acquired, Estimated, Prepaid Forward			9,200,000
Common Class A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number			1
Conversion of Stock, Shares Issued			1
Common Class B [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number			10
Convertible Senior Notes due 2022 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument \| $		$ 175.0
Interest rate		3.50%
Maximum number of shares issuable upon conversion of the notes		20,600,000
Convertible Senior Notes due 2025 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument \| $	$ 143.8
Interest rate	1.25%
Maximum number of shares issuable upon conversion of the notes	20,800,000