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Debt (Narrative) (Details)
€ in Millions, $ in Millions
6 Months Ended
Mar. 31, 2023
USD ($)
Mar. 03, 2023
USD ($)
Mar. 03, 2023
EUR (€)
Sep. 30, 2022
USD ($)
Debt Instrument [Line Items]        
Related party debt $ 822.1     $ 781.0
Current portion of long-term debt due to related party 133.6     129.0
Credit facilities of foreign subsidiaries | Foreign credit facilities        
Debt Instrument [Line Items]        
Maximum borrowing capacity 1,324.4      
Credit facility, amount borrowed and outstanding $ 823.5     $ 457.5
Basis spread (in percent) 1.35%      
Senior Notes | Green Bonds        
Debt Instrument [Line Items]        
Aggregate principal amount   $ 600.0 € 700  
Deferred financing charges and discounts $ 15.0      
Carrying amount $ 1,358.8      
Bonds | Saudi Riyal Loan Facility 4.10%        
Debt Instrument [Line Items]        
Interest rate (percent)       4.10%
Carrying amount       $ 195.6