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Fair Value Disclosures (Fair Value Of Certain Short And Long-term Debt, Based On Market Prices) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value Disclosures [Abstract]
Medium Term Notes at Fair Value	$ 1,803.6	$ 1,679.7
Medium-term notes at Book Value	1,703.9	1,632.3
Preferred securities underlying the junior convertible subordinated debentures at Fair Value	0	356.0
Preferred securities underlying the junior convertible subordinated debentures at Book Value	0	421.2
Convertible notes	$ 0.1	$ 0.1

Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis with original maturities ranging from 5-10 years.

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