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Description of the Business and Summary of Significant Accounting Policies - Stock-based compensation (Narrative) (Details) - Restricted Stock - shares shares in Millions	1 Months Ended	6 Months Ended
	Dec. 31, 2017	Jun. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Shares granted (in shares)		15.4
Chief Executive Officer | Co-Founder Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	10.3

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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