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Investments - Continuous Unrealized Loss (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
U.S. Government and Government Agencies and Authorities
Fixed Maturities:
Fair Value	$ 23.7	$ 52.0
Fair Value	404.6	401.6
Fair Value	428.3	453.6
Fixed Maturities:
Unrealized Losses	(0.2)	(0.8)
Unrealized Losses	(99.9)	(83.7)
Unrealized Losses	(100.1)	(84.5)
States and Political Subdivisions
Fixed Maturities:
Fair Value	224.0	112.9
Fair Value	963.9	928.3
Fair Value	1,187.9	1,041.2
Fixed Maturities:
Unrealized Losses	(5.9)	(2.3)
Unrealized Losses	(209.5)	(187.5)
Unrealized Losses	(215.4)	(189.8)
Foreign Governments
Fixed Maturities:
Fair Value	0.7	0.0
Fair Value	1.6	1.9
Fair Value	2.3	1.9
Fixed Maturities:
Unrealized Losses	0.0	0.0
Unrealized Losses	(0.5)	(0.6)
Unrealized Losses	(0.5)	(0.6)
Corporate Bonds and Notes
Fixed Maturities:
Fair Value	595.1	198.4
Fair Value	2,780.8	2,813.0
Fair Value	3,375.9	3,011.4
Fixed Maturities:
Unrealized Losses	(22.9)	(5.5)
Unrealized Losses	(487.0)	(378.3)
Unrealized Losses	(509.9)	(383.8)
Redeemable Preferred Stocks
Fixed Maturities:
Fair Value	3.2	0.0
Fair Value	6.4	7.9
Fair Value	9.6	7.9
Fixed Maturities:
Unrealized Losses	(0.1)	0.0
Unrealized Losses	(1.1)	(0.8)
Unrealized Losses	(1.2)	(0.8)
Collateralized Loan Obligations
Fixed Maturities:
Fair Value	124.5	38.8
Fair Value	158.5	747.7
Fair Value	283.0	786.5
Fixed Maturities:
Unrealized Losses	(0.2)	(0.4)
Unrealized Losses	(12.3)	(24.1)
Unrealized Losses	(12.5)	(24.5)
Other Mortgage- and Asset-backed
Fixed Maturities:
Fair Value	53.9	15.7
Fair Value	291.7	287.3
Fair Value	345.6	303.0
Fixed Maturities:
Unrealized Losses	(0.1)	(0.1)
Unrealized Losses	(40.7)	(46.2)
Unrealized Losses	(40.8)	(46.3)
Investments in Fixed Maturities
Fixed Maturities:
Fair Value	1,025.1	417.8
Fair Value	4,607.5	5,187.7
Fair Value	5,632.6	5,605.5
Fixed Maturities:
Unrealized Losses	(29.4)	(9.1)
Unrealized Losses	(851.0)	(721.2)
Unrealized Losses	$ (880.4)	$ (730.3)

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