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Debt (Revolving Credit Facility And Commercial Paper) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Revolving credit facility expiration date	Dec. 31, 2019
Outstanding commercial paper obligations	$ 477.1us-gaap_CommercialPaper	$ 28.0us-gaap_CommercialPaper
Revolving Credit Facility [Member]
Line of Credit Facility, Current Borrowing Capacity	800.0
Letter Of Credit Maximum Capacity Value	100.0
Line of Credit Facility, Competitive Bid Loans, Max	500.0
Outstanding commercial paper obligations	$ 477.1	$ 28.0

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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