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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	Mar. 31, 2012	Dec. 31, 2011
Fair Value Disclosures [Abstract]
Medium-term notes at Fair Value	$ 1,439.2	$ 1,679.7
Medium-term notes at Book Value	1,374.9	1,632.3
Preferred securities underlying the junior convertible subordinated debentures at Fair Value	398.1	356.0
Preferred securities underlying the junior convertible subordinated debentures at Book Value	$ 421.2	$ 421.2

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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