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Debt (Narrative) (Details)
€ in Millions
12 Months Ended
Mar. 31, 2017
Sep. 30, 2020
USD ($)
Sep. 30, 2020
EUR (€)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Sep. 30, 2018
USD ($)
Sep. 30, 2020
EUR (€)
Debt Instrument [Line Items]              
Deferred financing charges and discounts   $ 55,800,000   $ 12,200,000      
Repayments of long-term debt   406,600,000   428,600,000   $ 418,700,000  
Cash paid for interest, net of amounts capitalized   67,200,000   $ 155,900,000   123,100,000  
Senior Notes              
Debt Instrument [Line Items]              
Deferred financing charges and discounts   45,000,000          
Payable in U.S. Dollars | Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal amount   3,800,000,000          
Payable in Euro | Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal amount   $ 1,200,000,000         € 1,000.0
Eurobonds 2.0% due 2020 | Bonds              
Debt Instrument [Line Items]              
Interest rate, stated percentage   2.00%         2.00%
Repayments of long-term debt | €     € 300.0        
Amount classified as long-term debt based on ability and intent to refinance | €         € 300.0    
Foreign Line of Credit | Foreign Subsidiary Facility              
Debt Instrument [Line Items]              
Credit facility, amount borrowed and outstanding   $ 0          
Revolving Credit Facility | 2017 Credit Agreement              
Debt Instrument [Line Items]              
Credit facility, amount borrowed and outstanding   $ 0          
Maximum borrowing capacity           $ 2,300,000,000  
Debt instrument, term 5 years            
Revolving Credit Facility | 2017 Credit Agreement | Maximum              
Debt Instrument [Line Items]              
Covenant, ratio of total debt to total capitalization   70.00%         70.00%