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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale by Aging Category) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 33.3 | $ 11.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.2 | 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 34.1 | 42.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1.5 | 1.9
Debt Securities, Available-for-sale, Unrealized Loss Position | 67.4 | 53.4
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1.7 | 2.0
Corporate Bond Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 12.0 | 2.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.1 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13.8 | 18.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.6 | 0.9
Debt Securities, Available-for-sale, Unrealized Loss Position | 25.8 | 21.1
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.7 | 0.9
US Government and Agency Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 13.2 | 6.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.1 | 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13.5 | 16.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.7 | 0.8
Debt Securities, Available-for-sale, Unrealized Loss Position | 26.7 | 23.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.8 | 0.9
Asset-backed Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 8.1 | 1.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6.7 | 7.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.2 | 0.2
Debt Securities, Available-for-sale, Unrealized Loss Position | 14.8 | 8.9
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.2 | 0.2
Mortgage-backed Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0.0 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0.1 | 0.2
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 | $ 0.1 | $ 0.2

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