Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Financing Agreements (Narrative) (Details) - USD ($)		3 Months Ended			9 Months Ended
Financing Agreements (Narrative) (Details) - USD ($)	Apr. 23, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020	Oct. 07, 2019
Debt Instrument [Line Items]
Payment of long-term debt					$ (37,600,000)	$ (37,600,000)
Aggregate value of debt								$ 425,000,000.0
Unsecured debenture interest rate								4.375%
Payment for Debt Extinguishment or Debt Prepayment Cost				$ 12,200,000	(7,500,000)	(12,200,000)
Gain (Loss) on Extinguishment of Debt		$ (9,800,000)	$ 0		(9,800,000)	(15,600,000)
Write off of Deferred Debt Issuance Cost		2,300,000
Securitization Program [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	364 days
Revolving credit facility, matures September 2021		98,300,000			98,300,000		$ 82,200,000
Aggregate value of debt	$ 110,000,000.0
Line of Credit Facility [Line Items]
Revolving credit facility, matures September 2021		98,300,000			98,300,000		82,200,000
Note Securitization Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	364 days
Revolving credit facility, matures September 2021		90,000,000.0			90,000,000.0		90,000,000.0
Aggregate value of debt	$ 90,000,000.0
Line of Credit Facility [Line Items]
Revolving credit facility, matures September 2021		90,000,000.0			90,000,000.0		90,000,000.0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Senior revolving credit facility, maximum borrowing amount		1,030,000,000.0			1,030,000,000.0		1,191,000,000.0
Revolving credit facility, matures September 2021		160,000,000.0			160,000,000.0
Outstanding letters of credit		10,000,000.0			10,000,000.0		9,000,000.0
Line of Credit Facility [Line Items]
Revolving credit facility, matures September 2021		160,000,000.0			160,000,000.0
Line of Credit Facility, Maximum Borrowing Capacity		1,030,000,000.0			1,030,000,000.0		$ 1,191,000,000.0
Senior Unsecured 5.75% Notes due on September 1, 2023 [Member]
Debt Instrument [Line Items]
Payment for Debt Extinguishment or Debt Prepayment Cost						12,200,000
Gain (Loss) on Extinguishment of Debt						15,600,000
Write off of Deferred Debt Issuance Cost						$ 3,400,000
Senior Unsecured 5.00% Notes due on February 14, 2025 [Member]
Debt Instrument [Line Items]
Aggregate value of debt		$ 300,000,000.0			$ 300,000,000.0			$ 425.0
Unsecured debenture interest rate		5.00%			5.00%
Payment for Debt Extinguishment or Debt Prepayment Cost		$ 7,500,000
Senior Unsecured 4.375% Notes due September 2027 [Member]
Debt Instrument [Line Items]
Unsecured debenture interest rate		4.375%			4.375%
Senior Unsecured 5.75% Notes due September 2023
Debt Instrument [Line Items]
Unsecured debenture interest rate				575.00%