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Financing Agreements (Schedule of Total Debt) (Details) - USD ($)	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	May 01, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ (37,600,000)	$ 100,000
Long-term Debt, by Current and Noncurrent [Abstract]
Revolving credit facility, matures September 2021	250,100,000			$ 660,400,000
Total Long-term debt	1,782,600,000			1,783,100,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	7,200,000			7.2
Long-term Debt, by Current and Noncurrent [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,077,800,000
Line of Credit Facility, Remaining Borrowing Capacity				$ 1,112,800,000
Senior Unsecured 5.75% Notes due on September 1, 2023 [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Unsecured debenture interest rate	5.75%
Senior Unsecured 5.00% Notes due on February 14, 2025 [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Unsecured debenture interest rate				5.00%
Securitization Program [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Debt Instrument, Face Amount			$ 110,000,000.0
Note Securitization Facility [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Debt Instrument, Face Amount			$ 90,000,000.0