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Financing Agreements (Schedule of Total Debt) (Details) - USD ($)	3 Months Ended	6 Months Ended		12 Months Ended
	Dec. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	May 01, 2019
Debt Instrument [Line Items]
Repayments of Long-term Debt		$ (25,100,000)	$ 100,000
Long-term Debt, by Current and Noncurrent [Abstract]
Revolving credit facility, matures September 2021		245,600,000		$ 660,400,000
Total Long-term debt		1,864,400,000		1,783,100,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		7,200,000		7,200,000
Long-term Debt, by Current and Noncurrent [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,007.8
Line of Credit Facility, Remaining Borrowing Capacity				$ 1,112.8
Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate During Period	2.30%
Senior Secured Term Loan A [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Three					$ 0
Line of Credit Facility, Interest Rate During Period				0.00%
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Year Five					$ 0
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%			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%
Unsecured 7.00% Debentures Due on February 15, 2024 [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Unsecured debenture interest rate					7.00%
Unsecured 6.75% Debentures Due on December 15, 2027 [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Unsecured debenture interest rate					6.75%
Securitization Program [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Unsecured debenture interest rate					0.675%
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