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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	9 Months Ended
	Dec. 31, 2017	Sep. 30, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Shares granted (in shares)		14.6
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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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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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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