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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale	[1]	$ 68,251.0	$ 65,673.1
Fixed maturities, trading		1,023.3	836.2
Equity securities		2,295.0	1,478.1
Derivative instruments, assets		648.2	304.2
Separate account assets		173,327.1	167,605.6
Investment and universal life contracts		$ (578.4)	(115.5)
Fixed maturities valued using internal pricing models
Fixed maturities classified as Level 3 assets, percent valued using internal pricing models (as a percent)		3.00%
Amount measured at net asset value
Assets (liabilities) measured at fair value on a recurring basis
Unfunded commitments of investments measured using NAV		$ 3.1	7.1
U.S. government and agencies
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		1,637.9	1,528.8
Non-U.S. governments
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		495.7	507.9
States and political subdivisions
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,076.5	6,676.8
Corporate debt securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		35,702.6	35,810.0
Residential mortgage-backed pass-through securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		3,674.2	3,061.1
Commercial mortgage-backed securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		5,188.0	4,775.5
Collateralized debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,560.4	5,403.7
Other debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		8,915.7	7,909.3
Recurring Fair Value Measurements
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		68,251.0	65,673.1
Fixed maturities, trading		1,023.3	836.2
Equity securities		2,295.0	1,478.1
Mortgage loans		140.6
Derivative instruments, assets		648.2	304.2
Other investments		905.6	815.6
Cash equivalents		2,950.5	3,771.4
Market risk benefit asset		199.5	153.4
Sub-total excluding separate account assets		76,413.7	73,032.0
Separate account assets		173,327.1	167,605.6
Total assets		249,740.8	240,637.6
Investment and universal life contracts		(578.4)	(115.5)
Market risk benefit liability		(62.1)	(133.2)
Funds withheld payable embedded derivative		3,014.5	2,567.1
Long-term debt		(21.8)
Derivative liabilities		(506.2)	(494.0)
Other liabilities		(5.2)	(1.0)
Total liabilities		1,840.8	1,823.4
Net assets		251,581.6	242,461.0
Recurring Fair Value Measurements | Amount measured at net asset value
Assets (liabilities) measured at fair value on a recurring basis
Other investments		106.7	73.7
Sub-total excluding separate account assets		106.7	73.7
Separate account assets		7,573.6	8,692.0
Total assets		7,680.3	8,765.7
Net assets		7,680.3	8,765.7
Recurring Fair Value Measurements | Fair value hierarchy Level 1
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		1,261.0	1,247.1
Fixed maturities, trading			27.7
Equity securities		990.2	245.4
Other investments		262.2	220.1
Cash equivalents		271.6	511.6
Sub-total excluding separate account assets		2,785.0	2,251.9
Separate account assets		112,920.3	104,505.0
Total assets		115,705.3	106,756.9
Other liabilities		(5.2)
Total liabilities		(5.2)
Net assets		115,700.1	106,756.9
Recurring Fair Value Measurements | Fair value hierarchy Level 2
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		63,091.8	60,789.2
Fixed maturities, trading		460.7	392.7
Equity securities		1,304.8	1,232.7
Derivative instruments, assets		626.8	297.9
Other investments		405.5	356.7
Cash equivalents		2,678.9	3,259.8
Sub-total excluding separate account assets		68,568.5	66,329.0
Separate account assets		52,106.5	53,655.8
Total assets		120,675.0	119,984.8
Long-term debt		(21.8)
Derivative liabilities		(498.3)	(493.2)
Other liabilities			(1.0)
Total liabilities		(520.1)	(494.2)
Net assets		120,154.9	119,490.6
Recurring Fair Value Measurements | Fair value hierarchy Level 3
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		3,898.2	3,636.8
Fixed maturities, trading		562.6	415.8
Mortgage loans		140.6
Derivative instruments, assets		21.4	6.3
Other investments		131.2	165.1
Market risk benefit asset		199.5	153.4
Sub-total excluding separate account assets		4,953.5	4,377.4
Separate account assets		726.7	752.8
Total assets		5,680.2	5,130.2
Investment and universal life contracts		(578.4)	(115.5)
Market risk benefit liability		(62.1)	(133.2)
Funds withheld payable embedded derivative		3,014.5	2,567.1
Derivative liabilities		(7.9)	(0.8)
Total liabilities		2,366.1	2,317.6
Net assets		8,046.3	7,447.8
Recurring Fair Value Measurements | U.S. government and agencies
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		1,637.9	1,528.8
Recurring Fair Value Measurements | U.S. government and agencies | Fair value hierarchy Level 1
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		1,231.9	1,216.0
Recurring Fair Value Measurements | U.S. government and agencies | Fair value hierarchy Level 2
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		406.0	312.8
Recurring Fair Value Measurements | Non-U.S. governments
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		495.7	507.9
Recurring Fair Value Measurements | Non-U.S. governments | Fair value hierarchy Level 1
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale			0.2
Recurring Fair Value Measurements | Non-U.S. governments | Fair value hierarchy Level 2
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		495.7	507.7
Recurring Fair Value Measurements | States and political subdivisions
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,076.5	6,676.8
Recurring Fair Value Measurements | States and political subdivisions | Fair value hierarchy Level 2
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,009.7	6,606.9
Recurring Fair Value Measurements | States and political subdivisions | Fair value hierarchy Level 3
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		66.8	69.9
Recurring Fair Value Measurements | Corporate debt securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		35,702.6	35,810.0
Recurring Fair Value Measurements | Corporate debt securities | Fair value hierarchy Level 1
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		29.1	30.9
Recurring Fair Value Measurements | Corporate debt securities | Fair value hierarchy Level 2
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		33,323.1	33,473.2
Recurring Fair Value Measurements | Corporate debt securities | Fair value hierarchy Level 3
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		2,350.4	2,305.9
Recurring Fair Value Measurements | Residential mortgage-backed pass-through securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		3,674.2	3,061.1
Recurring Fair Value Measurements | Residential mortgage-backed pass-through securities | Fair value hierarchy Level 2
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		3,674.2	3,061.1
Recurring Fair Value Measurements | Commercial mortgage-backed securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		5,188.0	4,775.5
Recurring Fair Value Measurements | Commercial mortgage-backed securities | Fair value hierarchy Level 2
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		5,185.3	4,772.5
Recurring Fair Value Measurements | Commercial mortgage-backed securities | Fair value hierarchy Level 3
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		2.7	3.0
Recurring Fair Value Measurements | Collateralized debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,560.4	5,403.7
Recurring Fair Value Measurements | Collateralized debt obligations | Fair value hierarchy Level 2
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,560.4	5,328.3
Recurring Fair Value Measurements | Collateralized debt obligations | Fair value hierarchy Level 3
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale			75.4
Recurring Fair Value Measurements | Other debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		8,915.7	7,909.3
Recurring Fair Value Measurements | Other debt obligations | Fair value hierarchy Level 2
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		7,437.4	6,726.7
Recurring Fair Value Measurements | Other debt obligations | Fair value hierarchy Level 3
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		$ 1,478.3	$ 1,182.6
[1] See Note 4, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of asset at fair value held for benefit of separate account policyholder.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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