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Restricted Securities Available For Sale (Schedule Of Cost And Estimated Fair Values Of Debt Securities By Contractual Maturity) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Within one year, cost	$ 3.8us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	$ 41.6us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Over one year to five years, cost	45.1us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	7.8us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Over five years to ten years, cost	4.1us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	4.5us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
Over ten years, cost	0.3us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
Total restricted securities available for sale, cost	53.3us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost	53.9us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost
Within one year, estimated fair value	3.8us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	41.6us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Over one year to five years, estimated fair value	45.0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	7.8us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Over five years to ten years, estimated fair value	4.1us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	4.2us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Over ten years, fair value	0.3us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Total restricted securities available for sale, estimated fair value	$ 53.2us-gaap_AvailableForSaleSecuritiesRestricted	$ 53.6us-gaap_AvailableForSaleSecuritiesRestricted

X

- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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