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Indebtedness (Commercial Paper Narrative) (Details) (USD $)	3 Months Ended
	Dec. 31, 2012	Mar. 31, 2012
Debt Instrument [Line Items]
Short-term debt	$ 284,305,000	$ 388,452,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving line of credit, maximum borrowing capacity	750,000,000
Commercial paper [Member]
Debt Instrument [Line Items]
Revolving line of credit, maximum borrowing capacity	750,000,000
Short-term debt, terms	maturities that may vary, but will generally not exceed 90 days from the date of issue
Short-term debt	$ 284,305,000	$ 388,452,000
Debt Instrument, Interest Rate, Effective Percentage	0.48%
Maximum [Member] \| Commercial paper [Member]
Debt Instrument [Line Items]
Short term debt maturity period	90 days

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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- Definition

Description of the short-term debt arrangement, and disclosures pertaining to the underlying arrangements, including repayment terms, interest rates, restrictions on assets and activities, debt covenants, and other matters important to users of the financial statements.

+ References+ Details