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Subsequent Events Subsequent Events (Details) - USD ($)
Feb. 26, 2020
Feb. 06, 2020
May 08, 2017
Subsequent Event [Line Items]      
Stock repurchase program amount     $ 200,000,000
Subsequent Event | G4S Cash Management Operations      
Subsequent Event [Line Items]      
Subsequent event date Feb. 26, 2020    
Purchase consideration $ 860,000,000    
Annual revenues $ 800,000,000    
Subsequent Event | 250 Million Share Repurchase Program      
Subsequent Event [Line Items]      
Subsequent event date   Feb. 06, 2020  
Stock repurchase program amount   $ 250,000,000