Summary of Significant Accounting Policies - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Contract assets	$ 359.6	$ 294.3
Reserve for overhead rate disallowance	(5.4)	(5.7)
Contract assets, net of reserve	354.2	288.6
Contract liabilities	366.5	407.2
Net contract liabilities, net of reserve	$ (12.3)	$ (118.6)