Equity Method Investments - Schedule of Correction of Immaterial Error for the Period (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 34.6	$ 33.2	$ 121.6	$ 93.6
Loss from operations	(73.9)	(64.3)	(236.2)	(187.6)
Loss from equity method investment	(0.1)	(2.9)	(2.5)	(7.8)
Net loss	$ (64.0)	$ (66.2)	$ (212.5)	$ (199.6)
Net loss per common share, basic (in dollars per share)	$ (1.18)	$ (1.24)	$ (3.97)	$ (3.76)
Net loss per common share, diluted (in dollars per share)	$ (1.18)	$ (1.24)	$ (3.97)	$ (3.76)
Comprehensive loss	$ (61.0)	$ (69.0)	$ (202.5)	$ (219.8)
as previously reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		30.3		85.8
Loss from operations		(67.2)		(195.4)
Loss from equity method investment		0.0		0.0
Net loss		$ (66.2)		$ (199.6)
Net loss per common share, basic (in dollars per share)		$ (1.24)		$ (3.76)
Net loss per common share, diluted (in dollars per share)		$ (1.24)		$ (3.76)
Comprehensive loss		$ (69.0)		$ (219.8)
adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		2.9		7.8
Loss from operations		2.9		7.8
Loss from equity method investment		(2.9)		(7.8)
Net loss		$ 0.0		$ 0.0
Net loss per common share, basic (in dollars per share)		$ 0		$ 0
Net loss per common share, diluted (in dollars per share)		$ 0		$ 0
Comprehensive loss		$ 0.0		$ 0.0