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Investments Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Schedule of Fixed Income Securities [Table] [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,273.6 | $ 4,375.5
Available for sale, Unrealized Losses, Less than 12 Months | 12.3 | 75.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,935.4 | 2,731.7
Available for sale, Unrealized Losses, 12 Months or Greater | 49.3 | 88.7
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,209.1 | 7,107.2
U.S. & Canadian Governments [Member] |  |
Schedule of Fixed Income Securities [Table] [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 288.3 | 678.0
Available for sale, Unrealized Losses, Less than 12 Months | 3.9 | 17.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 599.6 | 679.2
Available for sale, Unrealized Losses, 12 Months or Greater | 26.8 | 43.4
Debt Securities, Available-for-sale, Unrealized Loss Position | 887.9 | 1,357.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 30.7 | 61.3
Municipal [Member] |  |
Schedule of Fixed Income Securities [Table] [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 14.3 | 14.4
Available for sale, Unrealized Losses, Less than 12 Months | 0.0 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 142.6 | 289.2
Available for sale, Unrealized Losses, 12 Months or Greater | 0.3 | 1.6
Debt Securities, Available-for-sale, Unrealized Loss Position | 157.0 | 303.6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.3 | 1.6
Corporate [Member] |  |
Schedule of Fixed Income Securities [Table] [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 971.0 | 3,683.0
Available for sale, Unrealized Losses, Less than 12 Months | 8.3 | 57.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,193.1 | 1,763.2
Available for sale, Unrealized Losses, 12 Months or Greater | 22.1 | 43.6
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,164.2 | 5,446.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 30.4 | 100.8
Fixed Income Securities [Member] |  |
Schedule of Fixed Income Securities [Table] [Line Items] |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 61.6 | $ 163.8

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