Subsequent Events (Details) - USD ($) $ in Millions			12 Months Ended
	Feb. 15, 2021	Feb. 08, 2021	Dec. 31, 2021	Dec. 31, 2020
G4S
Subsequent Event [Line Items]
Annual revenues				$ 740
Subsequent Event | G4S
Subsequent Event [Line Items]
Annual revenues			$ 800
Subsequent Event | G4S Tranche A
Subsequent Event [Line Items]
Subsequent event date		Feb. 08, 2021
Subsequent Event | G4S Tranche B
Subsequent Event [Line Items]
Subsequent event date	Feb. 15, 2021