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Debt (Revolving Credit Facility And Commercial Paper) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Amount available for borrowing	$ 800.0
Revolving credit facility expiration date	December 2, 2016
Outstanding commercial paper obligations	320.7	0
Standby Letters Of Credit [Member]
Standby letters of credit outstanding	$ 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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