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Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Amount outstanding, commercial paper	$ 57.0	$ 102.8
Remaining maturity, in days	3
Weighted average interest rate	0.40%
Long-Term Debt [Member]
Debt Instrument [Line Items]
Amount outstanding, commercial paper	$ 25.0

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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