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Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, net derivative assets (liabilities)	$ (13.1)	$ 2.0	$ 13.5	$ 5.5
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities)	$ 18.3	$ 4.5	$ (9.5)	$ (0.2)
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	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Net purchases, sales, issuances and settlements, net derivative assets (liabilities)	$ (0.3)	$ 2.8	$ 0.9	$ 4.0
Transfers into Level 3, net derivative assets (liabilities)		(0.1)		(0.1)
Ending balance, net derivative assets (liabilities)	4.9	9.2	4.9	9.2
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities)	20.1	4.3	(10.6)	0.7
Gross purchases, sales, issuances and settlements
Purchases, net derivative assets (liabilities)	(2.2)	2.9	(1.3)	3.2
Sales, net derivative assets (liabilities)	1.9	(0.1)	2.2	0.8
Net purchases, sales, issuances and settlements, net derivative assets (liabilities)	(0.3)	2.8	0.9	4.0
Investment and universal life contracts
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, liabilities	(863.7)	(230.0)	(578.4)	(115.5)
Total realized/unrealized gains (losses) included in net income, liabilities	$ (222.2)	$ (23.8)	$ (221.2)	$ (84.4)
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	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Net purchases, sales, issuances and settlements, liabilities	$ (142.9)	$ (114.2)	$ (429.2)	$ (168.1)
Ending balance, liabilities	(1,228.8)	(368.0)	(1,228.8)	(368.0)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities	(214.3)	(64.5)	(219.7)	(79.2)
Gross purchases, sales, issuances and settlements
Issuances, liabilities	(155.1)	(130.9)	(469.1)	(221.0)
Settlements, liabilities	12.2	16.7	39.9	52.9
Net purchases, sales, issuances and settlements, liabilities	(142.9)	(114.2)	(429.2)	(168.1)
Funds withheld payable embedded derivative
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, liabilities	2,825.2	2,997.0	3,014.5	2,567.1
Total realized/unrealized gains (losses) included in net income, liabilities	$ (266.0)	$ (776.8)	$ (455.3)	$ (346.9)
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	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Ending balance, liabilities	$ 2,559.2	$ 2,220.2	$ 2,559.2	$ 2,220.2
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities	(266.0)	(776.8)	(455.3)	(346.9)
Fixed maturities | Available-for-sale
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	4,327.8	3,771.0	3,898.2	3,636.8
Total realized/unrealized gains (losses) included in net income, assets	$ (21.5)	$ 8.6	$ (5.5)	$ 1.8
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	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Total realized/unrealized gains (losses) included in other comprehensive income, assets	$ 7.2	$ 55.9	$ 11.6	$ 10.2
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	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, assets	$ (2.0)	$ (76.1)	$ 310.5	$ 12.2
Transfers into Level 3, assets		4.6	121.5	214.6
Transfers out of Level 3, assets	(94.2)	(17.9)	(119.0)	(129.5)
Ending balance, assets	4,217.3	3,746.1	4,217.3	3,746.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets	(14.6)	8.3	6.3	1.1
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets	6.8	57.7	11.4	8.3
Gross purchases, sales, issuances and settlements
Purchases, assets	218.8	219.3	1,056.6	790.7
Sales, assets	(28.9)	(85.2)	(362.2)	(383.7)
Settlements, assets	(191.9)	(210.2)	(383.9)	(394.8)
Net purchases, sales, issuances and settlements, assets	(2.0)	(76.1)	310.5	12.2
States and political subdivisions | Available-for-sale
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	67.8	85.0	66.8	69.9
Total realized/unrealized gains (losses) included in other comprehensive income, assets	$ 0.9	$ 3.6	$ 2.8	$ 1.6
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	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, assets	$ (0.5)	$ (0.4)	$ (1.4)	$ 1.2
Transfers into Level 3, assets				15.5
Transfers out of Level 3, assets		(17.9)		(17.9)
Ending balance, assets	68.2	70.3	68.2	70.3
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets	0.9	3.6	2.8	1.7
Gross purchases, sales, issuances and settlements
Purchases, assets				2.5
Settlements, assets	(0.5)	(0.4)	(1.4)	(1.3)
Net purchases, sales, issuances and settlements, assets	(0.5)	(0.4)	(1.4)	1.2
Corporate debt securities | Available-for-sale
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	2,444.0	2,228.6	2,350.4	2,305.9
Total realized/unrealized gains (losses) included in net income, assets	$ (21.5)	$ 8.5	$ (5.6)	$ 1.7
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	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Total realized/unrealized gains (losses) included in other comprehensive income, assets	$ 3.8	$ 35.0	$ (4.1)	$ 6.1
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	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, assets	$ (10.9)	$ 34.3	$ 74.7	$ (66.2)
Transfers into Level 3, assets				58.9
Ending balance, assets	2,415.4	2,306.4	2,415.4	2,306.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets	(14.6)	8.2	6.3	1.0
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets	3.5	36.8	(5.0)	5.7
Gross purchases, sales, issuances and settlements
Purchases, assets	125.7	169.1	449.9	446.5
Sales, assets	(28.9)	(57.0)	(184.5)	(296.4)
Settlements, assets	(107.7)	(77.8)	(190.7)	(216.3)
Net purchases, sales, issuances and settlements, assets	(10.9)	34.3	74.7	(66.2)
Commercial mortgage-backed securities | Available-for-sale
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	2.6	2.8	2.7	3.0
Total realized/unrealized gains (losses) included in other comprehensive income, assets		0.1	$ 0.1	0.1
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
Net purchases, sales, issuances and settlements, assets	(0.1)	(0.1)	$ (0.3)	(0.3)
Ending balance, assets	2.5	2.8	2.5	2.8
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets		0.1	0.1	0.1
Gross purchases, sales, issuances and settlements
Settlements, assets	(0.1)	(0.1)	(0.3)	(0.3)
Net purchases, sales, issuances and settlements, assets	(0.1)	(0.1)	(0.3)	(0.3)
Collateralized debt obligations | Available-for-sale
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets		104.7		75.4
Total realized/unrealized gains (losses) included in other comprehensive income, assets		$ 3.0		$ 0.2
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
Net purchases, sales, issuances and settlements, assets		$ (13.8)		$ 18.3
Ending balance, assets		93.9		93.9
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets		2.9		1.0
Gross purchases, sales, issuances and settlements
Purchases, assets		3.0		35.1
Settlements, assets		(16.8)		(16.8)
Net purchases, sales, issuances and settlements, assets		(13.8)		18.3
Other debt obligations | Available-for-sale
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	1,813.4	1,349.9	1,478.3	1,182.6
Total realized/unrealized gains (losses) included in net income, assets		0.1	$ 0.1	0.1
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
Total realized/unrealized gains (losses) included in other comprehensive income, assets	$ 2.5	$ 14.2	$ 12.8	$ 2.2
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	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, assets	$ 9.5	$ (96.1)	$ 237.5	$ 59.2
Transfers into Level 3, assets		4.6	121.5	140.2
Transfers out of Level 3, assets	(94.2)		(119.0)	(111.6)
Ending balance, assets	1,731.2	1,272.7	1,731.2	1,272.7
Changes in unrealized gains (losses) included in net income relating to positions still held, assets		0.1		0.1
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets	2.4	14.3	13.5	(0.2)
Gross purchases, sales, issuances and settlements
Purchases, assets	93.1	47.2	606.7	306.6
Sales, assets		(28.2)	(177.7)	(87.3)
Settlements, assets	(83.6)	(115.1)	(191.5)	(160.1)
Net purchases, sales, issuances and settlements, assets	9.5	(96.1)	237.5	59.2
Mortgage loans
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets			140.6
Net purchases, sales, issuances and settlements, assets			(140.6)
Gross purchases, sales, issuances and settlements
Settlements, 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	119.3	173.5	131.2	165.1
Total realized/unrealized gains (losses) included in net income, assets	$ (2.5)	$ (5.3)	$ (2.7)	$ (16.7)
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	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Net purchases, sales, issuances and settlements, assets	$ 19.7	$ (26.7)	$ 8.0	$ (6.9)
Ending balance, assets	136.5	141.5	136.5	141.5
Changes in unrealized gains (losses) included in net income relating to positions still held, assets	0.4	(2.0)	4.7	(8.6)
Gross purchases, sales, issuances and settlements
Purchases, assets	58.7	25.5	119.6	144.2
Sales, assets			(1.5)
Settlements, assets	(39.0)	(52.2)	(110.1)	(151.1)
Net purchases, sales, issuances and settlements, assets	19.7	(26.7)	8.0	(6.9)
Fixed maturities, trading
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	491.9	445.2	562.6	415.8
Total realized/unrealized gains (losses) included in net income, assets	$ (3.4)	$ 7.5	$ (15.3)	$ 5.8
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	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Net purchases, sales, issuances and settlements, assets	$ 11.9	$ 40.1	$ (42.1)	$ 71.2
Transfers out of Level 3, assets			(4.8)
Ending balance, assets	500.4	492.8	500.4	492.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets	(14.8)	5.2	(14.9)	5.8
Gross purchases, sales, issuances and settlements
Purchases, assets	68.5	75.4	231.1	296.5
Sales, assets	(22.4)	(27.5)	(144.0)	(148.0)
Settlements, assets	(34.2)	(7.8)	(129.2)	(77.3)
Net purchases, sales, issuances and settlements, assets	11.9	40.1	(42.1)	71.2
Separate account assets
Changes in Level 3 fair value measurements rollforward, assets and liabilities
Beginning balance, assets	741.4	718.4	726.7	752.8
Total realized/unrealized gains (losses) included in net income, assets	$ 2.0	$ 2.2	$ 16.7	$ (30.4)
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	Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Net purchases, sales, issuances and settlements, assets		$ (6.8)		$ (8.6)
Ending balance, assets	$ 743.4	713.8	$ 743.4	713.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets	32.4	(13.5)	24.6	(20.6)
Gross purchases, sales, issuances and settlements
Sales, assets	(42.6)		(42.6)	(30.3)
Issuances, assets		(49.5)		(60.0)
Settlements, assets	$ 42.6	42.7	$ 42.6	81.7
Net purchases, sales, issuances and settlements, assets		$ (6.8)		$ (8.6)

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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- Definition

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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