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Revenue Recognition - Performance obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Revenue, remaining performance obligations    
Performance obligation $ 18,900.0  
Liability recognized $ 592.7 $ 595.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01    
Revenue, remaining performance obligations    
Performance Obligation expected timing of satisfaction period 12 months  
Performance obligation, percent to be satisfied 60.00%