Investment Securities (Schedule Of Interest And Dividends On Investments) (Details) (USD $) In Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010		Jun. 30, 2011	Jun. 30, 2010
Total interest and dividends	$ 7.8	$ 7.3	[1]	$ 15.5	$ 14.6	[1]
Interest Income [Member]
Total interest and dividends	6.9	6.3		14.6	11.9
Dividend Income [Member]
Total interest and dividends	$ 0.9	$ 1.0		$ 0.9	$ 2.7

[1] These restated balances were disclosed in Note 26 of the Company's Form 10-K for the year ended December 31, 2010.