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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 |  |

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