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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, 2026 | Dec. 31, 2025
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Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 40.4 | $ 8.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.3 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3.9 | 6.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.1
Debt Securities, Available-for-sale, Unrealized Loss Position | 44.3 | 14.7
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.3 | 0.1
Corporate Bond Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 15.7 | 1.1
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 | 1.5 | 4.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.1
Debt Securities, Available-for-sale, Unrealized Loss Position | 17.2 | 5.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.1 | 0.1
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 | 20.7 | 6.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.2 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1.5 | 1.4
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 | 22.2 | 8.3
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.2 | 0.0
Asset-backed Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 4.0 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0.9 | 1.2
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 | $ 4.9 | $ 1.2

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