Schedule II: Condensed Combined Financial Information of Registrant - Balance Sheet (Details) - USD ($) $ in Millions		Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Other investments		$ 4.4				$ 4.7
Cash and cash equivalents		762.1				706.0
Restricted cash		1.0				1.0
Other assets		81.7				73.8
Total assets		1,312.9				1,319.3
Liabilities:
Long-term debt and warrants		295.4				0.0
Accounts payable and accrued expenses		39.7				29.1
Other liabilities		45.0				39.9
Total liabilities		923.8				670.9
Commitments and Contingencies (Note 13)
Redeemable convertible preferred stock, $0.0001 par value, 14.1 shares issued and outstanding at December 31, 2022 and December 31, 2021 (liquidation preference of $126.5)		112.0				112.0	$ 0.0	$ 560.4
Stockholders’ equity:
Additional paid-in capital		1,850.7				1,806.1
Accumulated other comprehensive (loss) income		(5.8)				0.4
Accumulated loss		(1,567.8)				(1,270.1)
Total stockholders’ equity		277.1	$ 321.8	$ 381.3	$ 467.6	536.4	$ 1,032.4	$ (374.0)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity		1,312.9				1,319.3
Class A Shares
Stockholders’ equity:
Common stock	[1]	0.0				0.0
Class B Shares
Stockholders’ equity:
Common stock	[1]	0.0				0.0
Parent Company
Assets
Other investments		4.4				4.7
Cash and cash equivalents		551.8				432.3
Restricted cash		1.0				1.0
Investments in subsidiaries		97.6				0.0
Other assets		46.8				49.3
Intercompany receivable		22.1				261.8
Total assets		723.7				749.1
Liabilities:
Long-term debt and warrants		295.4				0.0
Investments in subsidiaries		0.0				58.5
Accounts payable and accrued expenses		16.6				8.8
Other liabilities		17.8				24.5
Intercompany payable		4.8				8.9
Total liabilities		334.6				100.7
Commitments and Contingencies (Note 13)
Redeemable convertible preferred stock, $0.0001 par value, 14.1 shares issued and outstanding at December 31, 2022 and December 31, 2021 (liquidation preference of $126.5)		112.0				112.0
Stockholders’ equity:
Additional paid-in capital		1,850.7				1,806.1
Accumulated other comprehensive (loss) income		(5.8)				0.4
Accumulated loss		(1,567.8)				(1,270.1)
Total stockholders’ equity		277.1				536.4
Total liabilities, redeemable convertible preferred stock and stockholders’ equity		723.7				749.1
Parent Company | Class A Shares
Stockholders’ equity:
Common stock	[2]	0.0				0.0
Parent Company | Class B Shares
Stockholders’ equity:
Common stock	[2]	$ 0.0				$ 0.0

[1] Reflects the 1-for-18 reverse stock split that became effective August 12, 2022. Refer to Note 2, “Basis of Presentation and Summary of Significant Accounting Policies.”

[2] Reflects the 1-for-18 reverse stock split that became effective August 12, 2022. Refer to Note 2, “Basis of Presentation and Summary of Significant Accounting Policies.”