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Revenue Recognition - Performance obligations (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Revenue Recognition    
Performance obligation $ 20,700.0  
Recognized revenue $ 764.7 $ 869.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01    
Revenue Recognition    
Performance obligation, percent to be satisfied 58.00%  
Performance obligation expected timing of satisfaction period 12 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01    
Revenue Recognition    
Performance obligation expected timing of satisfaction period 2 years