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Debt (Revolving Credit Facility And Commercial Paper) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013
Outstanding commercial paper obligations	$ 161.4	$ 161.4	$ 95.0
Revolving Credit Facility [Member]
Revolving credit facility expiration date	Dec. 01, 2018
Line of Credit Facility, Current Borrowing Capacity	800.0	800.0
Letter Of Credit Maximum Capacity Value	100.0	100.0
Line of Credit Facility, Competitive Bid Loans, Max		500.0
Outstanding commercial paper obligations	$ 161.4	$ 161.4	$ 95.0

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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