Other Comprehensive Income (Reconciliation Of Gross Unrealized Investment Gains) (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Other Comprehensive Income [Abstract]
Unrealized gains arising during period, Pre-Tax	$ 15.4	$ 110.8	$ 74.6	$ 245.8
Unrealized gains arising during period, Tax Benefit (Expense)	7.8	(26.4)	12.9	(58.1)
Unrealized gains arising during period, Net of Tax	23.2	84.4	87.5	187.7
Less: reclassification adjustments for gains realized in net income, Pre-Tax	8.4	9.4	24.7	18.7
Less: reclassification adjustments for gains realized in net income, Tax Benefit (Expense)	(1.9)	(0.5)	2.4	(0.7)
Less: reclassification adjustments for gains realized in net income, Net of Tax	6.5	8.9	27.1	18.0
Total available-for-sale securities, Pre-Tax	7.0	101.4	49.9	227.1
Total available-for-sale securities, Tax Benefit (Expense)	9.7	(25.9)	10.5	(57.4)
Total available-for-sale securities	16.7	75.5	60.4	169.7
Unrealized losses arising during period, Pre-Tax	0.1		(1.8)
(Provision) benefit for deferred income taxes	(0.1)		0.6
Unrealized losses arising during period, Net of Tax			(1.2)
Other comprehensive income, Pre-Tax	7.1	101.4	48.1	227.1
Other comprehensive income, Tax Benefit (Expense)	9.6	(25.9)	11.1	(57.4)
Other comprehensive income, Net of Tax	$ 16.7	$ 75.5	$ 59.2	$ 169.7

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Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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