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Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax	Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax	Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax	Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax	Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
Beginning balance, net derivative assets (liabilities)	$ 5.5	$ (3.4)
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities)	$ 7.5	$ 3.9	$ (5.4)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Total realized/unrealized gains (losses) included in other comprehensive income, net derivative assets (liabilities)			$ (0.3)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax	Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax	Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
Net purchases, sales, issuances and settlements, net derivative assets (liabilities)	$ 0.8	$ 4.9	$ 2.6
Transfers into Level 3, net derivative assets (liabilities)	0.1	0.1
Transfers out of Level 3, net derivative assets (liabilities)	(0.4)		(0.3)
Ending balance, net derivative assets (liabilities)	13.5	5.5	(3.4)
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities)	7.8	7.5	(3.4)
Changes in unrealized gains (losses) included in OCI relating to positions still held, derivative assets			(0.2)
Gross purchases, sales, issuances and settlements
Purchases, net derivative assets (liabilities)	0.4	0.8
Sales, net derivative assets (liabilities)	0.4	4.1	2.6
Net purchases, sales, issuances and settlements, net derivative assets (liabilities)	0.8	4.9	2.6
Investment and universal life contracts
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, liabilities	(115.5)	(46.4)	(83.2)
Total realized/unrealized gains (losses) included in net income, liabilities	(166.3)	(37.7)	35.9
Net purchases, sales, issuances and settlements, liabilities	(296.6)	(31.4)	0.9
Ending balance, liabilities	(578.4)	(115.5)	(46.4)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities	(155.8)	(29.2)	22.6
Gross purchases, sales, issuances and settlements
Issuances, liabilities	(364.4)	(69.9)	(22.2)
Settlements, liabilities	67.8	38.5	23.1
Net purchases, sales, issuances and settlements, liabilities	(296.6)	(31.4)	0.9
Funds withheld payable embedded derivative
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, liabilities	2,567.1	3,652.8
Total realized/unrealized gains (losses) included in net income, liabilities	447.4	(1,085.7)	3,652.8
Ending balance, liabilities	3,014.5	2,567.1	3,652.8
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities	447.4	(1,085.7)	3,652.8
Fixed maturities | Available-for-sale
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	3,636.8	2,166.6	1,076.2
Total realized/unrealized gains (losses) included in net income, assets	(28.0)	(3.2)	(5.1)
Total realized/unrealized gains (losses) included in other comprehensive income, assets	(28.1)	17.1	(75.1)
Net purchases, sales, issuances and settlements, assets	235.4	1,294.3	1,246.1
Transfers into Level 3, assets	214.6	451.9	188.3
Transfers out of Level 3, assets	(132.5)	(289.9)	(263.8)
Ending balance, assets	3,898.2	3,636.8	2,166.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets	(38.9)	2.2	(1.3)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets	(27.5)	(72.1)	(61.1)
Gross purchases, sales, issuances and settlements
Purchases, assets	1,298.2	1,545.5	1,456.6
Sales, assets	(513.6)	(27.7)	(62.7)
Settlements, assets	(549.2)	(223.5)	(147.8)
Net purchases, sales, issuances and settlements, assets	235.4	1,294.3	1,246.1
States and political subdivisions | Available-for-sale
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	69.9	70.9	94.8
Total realized/unrealized gains (losses) included in other comprehensive income, assets	(1.5)	0.7	(24.1)
Net purchases, sales, issuances and settlements, assets	0.8	(1.7)	(1.6)
Transfers into Level 3, assets	15.5		12.0
Transfers out of Level 3, assets	(17.9)		(10.2)
Ending balance, assets	66.8	69.9	70.9
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets	(1.4)	(4.1)	(22.3)
Gross purchases, sales, issuances and settlements
Purchases, assets	2.5
Settlements, assets	(1.7)	(1.7)	(1.6)
Net purchases, sales, issuances and settlements, assets	0.8	(1.7)	(1.6)
Corporate debt securities | Available-for-sale
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	2,305.9	1,568.3	834.3
Total realized/unrealized gains (losses) included in net income, assets	(28.2)	(4.5)	(4.8)
Total realized/unrealized gains (losses) included in other comprehensive income, assets	(25.1)	13.3	(28.6)
Net purchases, sales, issuances and settlements, assets	38.9	593.6	626.3
Transfers into Level 3, assets	58.9	212.4	176.3
Transfers out of Level 3, assets		(77.2)	(35.2)
Ending balance, assets	2,350.4	2,305.9	1,568.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets	(39.1)	0.3	(1.3)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets	(25.7)	(38.9)	(19.8)
Gross purchases, sales, issuances and settlements
Purchases, assets	659.3	815.2	817.3
Sales, assets	(322.2)	(27.7)	(50.4)
Settlements, assets	(298.2)	(193.9)	(140.6)
Net purchases, sales, issuances and settlements, assets	38.9	593.6	626.3
Commercial mortgage-backed securities | Available-for-sale
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	3.0	3.4	19.2
Total realized/unrealized gains (losses) included in other comprehensive income, assets			(1.0)
Net purchases, sales, issuances and settlements, assets	(0.3)	(0.4)	(4.6)
Transfers out of Level 3, assets			(10.2)
Ending balance, assets	2.7	3.0	3.4
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets			(0.5)
Gross purchases, sales, issuances and settlements
Sales, assets			(4.1)
Settlements, assets	(0.3)	(0.4)	(0.5)
Net purchases, sales, issuances and settlements, assets	(0.3)	(0.4)	(4.6)
Collateralized debt obligations | Available-for-sale
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	75.4	56.2	85.8
Total realized/unrealized gains (losses) included in other comprehensive income, assets	(0.7)	1.9	(1.0)
Net purchases, sales, issuances and settlements, assets	(71.7)	165.8	151.8
Transfers out of Level 3, assets	(3.0)	(148.5)	(180.4)
Ending balance, assets		75.4	56.2
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets	0.1	0.7
Gross purchases, sales, issuances and settlements
Purchases, assets	35.1	167.0	151.9
Sales, assets	(90.0)
Settlements, assets	(16.8)	(1.2)	(0.1)
Net purchases, sales, issuances and settlements, assets	(71.7)	165.8	151.8
Other debt obligations | Available-for-sale
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	1,182.6	467.8	42.1
Total realized/unrealized gains (losses) included in net income, assets	0.2	1.3	(0.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets	(0.8)	1.2	(20.4)
Net purchases, sales, issuances and settlements, assets	267.7	537.0	474.2
Transfers into Level 3, assets	140.2	239.5
Transfers out of Level 3, assets	(111.6)	(64.2)	(27.8)
Ending balance, assets	1,478.3	1,182.6	467.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets	0.2	1.9
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets	(0.5)	(29.8)	(18.5)
Gross purchases, sales, issuances and settlements
Purchases, assets	601.3	563.3	487.4
Sales, assets	(101.4)		(8.2)
Settlements, assets	(232.2)	(26.3)	(5.0)
Net purchases, sales, issuances and settlements, assets	267.7	537.0	474.2
Fixed maturities, trading
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	415.8	134.0	4.9
Total realized/unrealized gains (losses) included in net income, assets	(0.7)	2.4	(0.6)
Net purchases, sales, issuances and settlements, assets	147.5	279.4	100.7
Transfers into Level 3, assets			29.0
Ending balance, assets	562.6	415.8	134.0
Changes in unrealized gains (losses) included in net income relating to positions still held, assets	(6.2)	2.0	(0.6)
Gross purchases, sales, issuances and settlements
Purchases, assets	422.9	439.3	134.7
Sales, assets	(166.9)	(145.2)	(32.6)
Settlements, assets	(108.5)	(14.7)	(1.4)
Net purchases, sales, issuances and settlements, assets	147.5	279.4	100.7
Mortgage loans
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Net purchases, sales, issuances and settlements, assets	140.6
Ending balance, assets	140.6
Gross purchases, sales, issuances and settlements
Purchases, assets	140.6
Net purchases, sales, issuances and settlements, assets	140.6
Other investments
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	165.1	1.9	2.1
Total realized/unrealized gains (losses) included in net income, assets	(22.8)	(5.7)
Total realized/unrealized gains (losses) included in other comprehensive income, assets			(0.6)
Net purchases, sales, issuances and settlements, assets	(11.1)	168.9	0.4
Ending balance, assets	131.2	165.1	1.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets	(10.0)	(5.2)
Gross purchases, sales, issuances and settlements
Purchases, assets	182.3	194.2	0.4
Settlements, assets	(193.4)	(25.3)
Net purchases, sales, issuances and settlements, assets	(11.1)	168.9	0.4
Separate account assets
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	752.8	1,034.9	945.3
Total realized/unrealized gains (losses) included in net income, assets	(17.5)	(8.7)	113.5
Net purchases, sales, issuances and settlements, assets	(8.6)	(273.4)	(23.9)
Ending balance, assets	726.7	752.8	1,034.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets	(9.8)	(80.3)	89.8
Gross purchases, sales, issuances and settlements
Purchases, assets			11.8
Sales, assets	(30.3)	(286.3)	(4.5)
Issuances, assets	(60.0)	(109.1)	(50.0)
Settlements, assets	81.7	122.0	18.8
Net purchases, sales, issuances and settlements, assets	$ (8.6)	$ (273.4)	$ (23.9)

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Amount of net issuances of financial instruments measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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