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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Net loss $ (494.1) $ (270.2) $ (388.0)
Other comprehensive (loss) income:      
Unrealized (loss) gain on investments   (0.1) 0.4
Comprehensive loss $ (494.1) $ (270.3) $ (387.6)