Debt (Summary Of Outstanding Debt) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Medium-term notes	$ 1,374.9	$ 1,632.3
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	436.7	436.7
Junior convertible subordinated debentures	436.7	436.7
Commercial paper	320.7	0
Receivables facility	175.0	100.0
Other debt	5.8	7.8
Total debt	2,313.1	2,176.8
Short-term debt	(496.9)	(103.6)
Current portion of long-term debt	(12.8)	(263.9)
Long-term debt	$ 1,803.4	$ 1,809.3