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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale by Aging Category) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 55.5 | $ 40.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1.6 | 1.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 22.3 | 26.9
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 | 77.8 | 66.9
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3.5 | 3.8
Corporate Bond Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 21.3 | 15.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.6 | 0.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11.4 | 13.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1.0 | 1.1
Debt Securities, Available-for-sale, Unrealized Loss Position | 32.7 | 28.4
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1.6 | 1.7
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 | 21.5 | 18.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.8 | 0.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 7.6 | 9.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.7 | 0.9
Debt Securities, Available-for-sale, Unrealized Loss Position | 29.1 | 27.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1.5 | 1.7
Asset-backed Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 12.5 | 6.6
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 | 3.3 | 4.4
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 | 15.8 | 11.0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.4 | 0.4
Mortgage-backed Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0.2 | 0.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 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

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