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Acquisitions and Divestitures - CGD Services - Income (loss) from discontinued operations (Details) - Cubic Global Defense Services - Disposed of by sale - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2019
Jun. 30, 2018
Apr. 18, 2018
Divestitures      
Consideration from sale   $ 133.8 $ 135.0
Increase (decrease) in working capital settlement receivable $ 0.6    
Net receivable $ 2.4