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Stockholders’ Deficit - Co-Founder Grant (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended
	Dec. 31, 2017	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2021	Sep. 30, 2025	Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense		$ 78.6	$ 92.3		$ 223.4	$ 260.8
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)					14.6
Awards vesting (in shares)					0.0
Co-Founder Grant | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Trading period	30 days
Allocated share-based compensation expense			$ 0.4			$ 2.3
Co-Founder Grant | Chief Executive Officer | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	10.3
Awards vesting (in shares)				2.1

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