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Long-term and Short-term Debt - Narrative (Details)
1 Months Ended
Apr. 20, 2020
USD ($)
May 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]          
Short-term debt       $ 422,800,000 $ 0
Proceeds from derivative instrument, financing activities   $ 22,000,000.0      
Gain (loss) on hedging activity   $ 22,000,000.0      
2.050% notes, payable in March 2020          
Debt Instrument [Line Items]          
Repayments of debt     $ 300,000,000.0    
Stated interest rate     2.05% 2.05%  
2.875% notes, payable in March 2025          
Debt Instrument [Line Items]          
Stated interest rate   2.875%   2.875%  
Notes Payable, Other Payables          
Debt Instrument [Line Items]          
Line of credit facility, current borrowing capacity $ 1,250,000,000        
Interest Bearing Loan          
Debt Instrument [Line Items]          
Short-term debt       $ 23,500,000  
Loans          
Debt Instrument [Line Items]          
Short-term debt       $ 399,300,000  
Notes Payable to Banks          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 400,000,000.0        
Debt instrument, term 364 days        
Ratio of EBITDA to interest expense 3.0