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Stockholders’ Deficit - Co-Founder Grant (Narrative) (Details) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2017 tranche shares	Mar. 31, 2024 USD ($) shares	Mar. 31, 2023 USD ($)	Dec. 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense | $		$ 78.0	$ 76.0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)		1.8
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 | $		$ 1.1	$ 2.2
Remaining unamortized stock-based compensation | $		$ 1.3
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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