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Stockholders’ Deficit - Co-Founder Grant (Narrative) (Details) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended
	Dec. 31, 2017 tranche shares	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2021 shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense | $		$ 92.3	$ 83.8		$ 260.8	$ 255.1
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)					19.0
Vesting period					4 years
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
Number of tranches | tranche	9
Trading period	30 days
Allocated share-based compensation expense | $		0.4	$ 1.5		$ 2.3	$ 5.7
Remaining unamortized stock-based compensation | $		$ 0.1			$ 0.1
Co-Founder Grant | Restricted Stock | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Co-Founder Grant | Restricted Stock | Tranche One | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vested maximum	20.00%
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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