Balance Sheet Accounts - Schedule of Other Current Assets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred costs recoverable from the U.S. government	$ 37.7	$ 36.9
Income tax receivable	20.4	24.7
Inventories	18.2	15.8
Prepaid expenses	17.2	16.4
Other	23.3	61.8
Other current assets	$ 116.8	$ 155.6