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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale by Aging Category) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 54.6 | $ 33.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2.3 | 0.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5.6 | 1.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.5 | 0.0
Debt Securities, Available-for-sale, Unrealized Loss Position | 60.2 | 34.8
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 2.8 | 0.4
Corporate Bond Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 19.5 | 15.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1.1 | 0.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4.5 | 1.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.4 | 0.0
Debt Securities, Available-for-sale, Unrealized Loss Position | 24.0 | 16.3
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1.5 | 0.2
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 | 24.2 | 10.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1.0 | 0.1
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 | 24.2 | 10.1
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1.0 | 0.1
Asset-backed Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 8.9 | 8.4
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 | 1.1 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.1 | 0.0
Debt Securities, Available-for-sale, Unrealized Loss Position | 10.0 | 8.4
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.3 | 0.1
Commercial Paper [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 |
Mortgage-backed Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0.3 | 0.0
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 | $ 0.3 | $ 0.0

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