Long-Term Debt (Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Mar. 31, 2012	Sep. 30, 2011
Debt Instrument [Line Items]
Senior notes	$ 750.0
Long-term debt, total	1,960.9	2,181.5
Plus: Unamortized premium (discount), net	3.1	3.1
Plus: Unamortized adjustment related to interest rate fair value hedge	17.2	18.6
Less: Current portion	(85.7)	(30.7)
Long-term Debt	1,895.5	2,172.5
Fixed Rate Senior Notes, Series C [Member]
Debt Instrument [Line Items]
Senior notes	50.0	50.0
Debt instrument interest rate	5.43%	5.43%
Fixed Rate Senior Notes, Series D [Member]
Debt Instrument [Line Items]
Senior notes	21.4	32.1
Debt instrument interest rate	4.76%	4.76%
Fixed Rate Senior Notes, Series E [Member]
Debt Instrument [Line Items]
Senior notes	100.0	100.0
Debt instrument interest rate	5.57%	5.57%
Fixed Rate Senior Notes, Series F [Member]
Debt Instrument [Line Items]
Senior notes	75.0	75.0
Debt instrument interest rate	5.43%	5.43%
Fixed Rate Senior Notes, Series I-1 [Member]
Debt Instrument [Line Items]
Senior notes	75.0	75.0
Debt instrument interest rate	5.56%	5.56%
Fixed Rate Senior Notes, Series I-2 [Member]
Debt Instrument [Line Items]
Senior notes	25.0	25.0
Debt instrument interest rate	5.58%	5.58%
Fixed Rate Senior Notes, Series J [Member]
Debt Instrument [Line Items]
Senior notes	100.0	100.0
Debt instrument interest rate	5.93%	5.93%
Fixed Rate Senior Notes Maturing 2018 [Member]
Debt Instrument [Line Items]
Senior notes	577.5	577.5
Senior notes maturity date	2018
Debt instrument interest rate	7.29%	7.29%
Floating Rate Senior Notes Maturing 2018 [Member]
Debt Instrument [Line Items]
Senior notes	20.0	20.0
Senior notes maturity date	2018
Debt instrument interest rate	3.04%	2.80%
Fixed Rate Senior Notes Maturing 2020 [Member]
Debt Instrument [Line Items]
Senior notes	67.0	67.0
Senior notes maturity date	2020
Debt instrument interest rate	7.39%	7.39%
4.95% Senior Notes Maturing 2020 [Member]
Debt Instrument [Line Items]
Senior notes	300.0	300.0
Senior notes maturity date	2020
Debt instrument interest rate	4.95%	4.95%
Fixed Rate Senior Notes Maturing 2039 [Member]
Debt Instrument [Line Items]
Senior notes	450.0	450.0
Senior notes maturity date	2039
Debt instrument interest rate	6.63%	6.63%
Fixed Rate Senior Notes, Series 2009A [Member]
Debt Instrument [Line Items]
Senior notes	50.0	50.0
Debt instrument interest rate	7.45%	7.45%
Fixed Rate Senior Notes, Series 2009B [Member]
Debt Instrument [Line Items]
Senior notes	50.0	50.0
Debt instrument interest rate	7.60%	7.60%
2010 Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Revolving credit agreement		19.9
Debt instrument interest rate		2.62%
2010 Term Loan [Member]
Debt Instrument [Line Items]
Term loan		$ 190.0
Debt instrument interest rate		2.75%

Senior note maturity date.

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- Definition

The effective interest rate at the end of the reporting period.

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- Definition

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge.

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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