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Restricted Securities Available For Sale (Schedule Of Restricted Securities Available For Sale By Aging Category) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 11.1 | $ 40.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 42.3 | 26.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.1 | 1.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1.9 | 2.3
Debt Securities, Available-for-sale, Unrealized Loss Position | 53.4 | 66.9
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 2.0 | 3.8
Corporate bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2.7 | 15.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 18.4 | 13.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.0 | 0.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.9 | 1.1
Debt Securities, Available-for-sale, Unrealized Loss Position | 21.1 | 28.4
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.9 | 1.7
US Government and agency securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 6.8 | 18.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 16.4 | 9.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.1 | 0.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.8 | 0.9
Debt Securities, Available-for-sale, Unrealized Loss Position | 23.2 | 27.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.9 | 1.7
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1.6 | 6.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 7.3 | 4.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.0 | 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.2 | 0.3
Debt Securities, Available-for-sale, Unrealized Loss Position | 8.9 | 11.0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.2 | 0.4
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0.0 | 0.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0.2 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.0 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.0
Debt Securities, Available-for-sale, Unrealized Loss Position | 0.2 | 0.3
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 0.0 | $ 0.0

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