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Stockholders' equity - Common Stock (Details) - $ / shares		1 Months Ended
	Jun. 06, 2025	Aug. 31, 2025	Jun. 30, 2025	Mar. 31, 2026	Dec. 31, 2025
Class of Stock
Preferred stock, shares authorized (in shares)	500,000,000.0
Employee Stock
Class of Stock
Common stock reserved for future issuance				8,100,000
Common Stock Issuable In Connection With Business Combinations
Class of Stock
Common stock reserved for future issuance				1,200,000
Common Stock Issuable Under Stock Award Plan
Class of Stock
Common stock reserved for future issuance				27,200,000
Common Stock Available For Future Issuance Under Stock Award Plan
Class of Stock
Common stock reserved for future issuance				37,000,000.0
Class A common stock
Class of Stock
Common stock, shares authorized (in shares)	2,500,000,000			2,500,000,000	2,500,000,000
Common stock, par or stated value per share (in dollars per share)	$ 0.0001			$ 0.0001	$ 0.0001
Preferred stock par value (in dollars per share)	$ 0.0001
Common stock, shares, issued (in shares)				228,900,000	223,600,000
Conversion of stock, shares issued	139,800,000
Class A common stock \| IPO
Class of Stock
Number of shares issued (in shares)			19,900,000
Purchase price per share (in dollars per share)			$ 31.00
Class A common stock \| Follow-on Public Offering
Class of Stock
Number of shares issued (in shares)		3,500,000
Purchase price per share (in dollars per share)		$ 130.00
Class B common stock
Class of Stock
Common stock, shares authorized (in shares)	500,000,000.0			500,000,000.0
Common stock, par or stated value per share (in dollars per share)	$ 0.0001			$ 0.0001	$ 0.0001
Common stock, shares, issued (in shares)				18,700,000	18,700,000
Class B common stock \| Co-Founder
Class of Stock
Conversion of stock, shares issued	19,600,000
Common Class C
Class of Stock
Common stock, shares authorized (in shares)				500,000,000.0	500,000,000.0
Common stock, par or stated value per share (in dollars per share)	$ 0.0001			$ 0.0001	$ 0.0001
Common stock, shares, issued (in shares)	500,000,000.0			0	0