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Revenue Recognition - Performance obligations (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue, remaining performance obligations    
Performance obligation $ 19,200.0  
Liability recognized $ 464.3 $ 410.1
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%