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Debt (Narrative) (Details)
$ in Millions, € in Billions
1 Months Ended 12 Months Ended
Mar. 31, 2021
Nov. 18, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2020
EUR (€)
Debt Instrument [Line Items]                
Related party debt     $ 781.0 $ 358.4        
Current portion of long-term debt due to related party     129.0 83.8        
Cash paid for interest, net of amounts capitalized     128.5 150.4 $ 67.2      
Repayments of long-term debt     400.0 462.9 406.6      
Proceeds from issuance debt     $ 766.2 178.9 4,895.8      
Payable in U.S. Dollars | Senior Notes                
Debt Instrument [Line Items]                
Aggregate principal amount         $ 3,800.0      
Payable in Euro | Senior Notes                
Debt Instrument [Line Items]                
Aggregate principal amount | €               € 1.0
Note 3.0% due 2022 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage   3.00% 3.00%          
Repayments of long-term debt   $ 400.0            
Revolving credit agreement | Credit Agreement 2021                
Debt Instrument [Line Items]                
Term of credit facility (in years) 5 years              
Maximum borrowing capacity     $ 2,750.0     $ 2,750.0 $ 2,500.0  
Credit facility, amount borrowed and outstanding     0.0          
Revolving credit agreement | Credit Agreement 2021 | Maximum                
Debt Instrument [Line Items]                
Debt covenant, maximum ratio of total debt to capitalization             70.00%  
Foreign credit facilities | Foreign subsidiaries facilities                
Debt Instrument [Line Items]                
Maximum borrowing capacity     749.0          
Credit facility, amount borrowed and outstanding     $ 457.5          
Foreign credit facilities | Credit Facilities, Foreign Subsidiaries                
Debt Instrument [Line Items]                
Credit facility, amount borrowed and outstanding       $ 176.2