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Investments Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
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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