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Debt - Additional information (Details)
6 Months Ended
Dec. 31, 2019
Mar. 31, 2020
GBP (£)
Mar. 31, 2020
USD ($)
Multi-currency revolving credit facility due 2024      
Debt Instrument [Line Items]      
Maximum borrowing capacity     $ 1,400,000,000
Facility fee 0.09%    
Multi-currency revolving credit facility due 2024 | Minimum      
Debt Instrument [Line Items]      
Facility fee   0.05%  
Multi-currency revolving credit facility due 2024 | Maximum      
Debt Instrument [Line Items]      
Facility fee   0.125%  
Multi-currency revolving credit facility due 2024 | CDOR / LIBOR / EURIBOR / Bankers Acceptance Stamping Fee      
Debt Instrument [Line Items]      
Variable rate spread 0.91%    
Multi-currency revolving credit facility due 2024 | CDOR / LIBOR / EURIBOR / Bankers Acceptance Stamping Fee | Minimum      
Debt Instrument [Line Items]      
Variable rate spread   0.70%  
Multi-currency revolving credit facility due 2024 | CDOR / LIBOR / EURIBOR / Bankers Acceptance Stamping Fee | Maximum      
Debt Instrument [Line Items]      
Variable rate spread   1.125%  
Multi-currency revolving credit facility due 2024 | Alternate base rate and Canadian prime rate | Minimum      
Debt Instrument [Line Items]      
Variable rate spread   0.00%  
Multi-currency revolving credit facility due 2024 | Alternate base rate and Canadian prime rate | Maximum      
Debt Instrument [Line Items]      
Variable rate spread   0.125%  
Commercial paper      
Debt Instrument [Line Items]      
Maximum borrowing capacity     1,400,000,000
Debt instrument, term   365 days  
Amount outstanding     0
Receivables securitization facility due 2022      
Debt Instrument [Line Items]      
Maximum borrowing capacity     1,450,000,000
Potential increase in receivables securitization facility     250,000,000
Revolving credit note      
Debt Instrument [Line Items]      
Maximum borrowing capacity     $ 75,000,000
Overdraft facility due 2021 (£30,000)      
Debt Instrument [Line Items]      
Maximum borrowing capacity | £   £ 30,000,000