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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale by Aging Category) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 4.2 | $ 37.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.0 | 0.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 7.8 | 16.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.1 | 0.4
Debt Securities, Available-for-sale, Unrealized Loss Position | 12.0 | 53.9
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.1 | 0.8
Corporate Bond Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2.0 | 13.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.0 | 0.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4.6 | 8.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.1 | 0.2
Debt Securities, Available-for-sale, Unrealized Loss Position | 6.6 | 21.5
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.1 | 0.4
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 | 2.2 | 19.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.0 | 0.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2.0 | 4.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.2
Debt Securities, Available-for-sale, Unrealized Loss Position | 4.2 | 24.7
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.0 | 0.4
Asset-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 | 2.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1.2 | 3.6
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 | $ 1.2 | 6.0
Mortgage-backed Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 1.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0.0
Debt Securities, Available-for-sale, Unrealized Loss Position |  | $ 1.7

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