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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions		Jun. 30, 2024	Dec. 31, 2023
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale	[1]	$ 65,768.8	$ 65,673.1
Fixed maturities, trading		786.1	836.2
Equity securities		1,512.8	1,478.1
Derivative instruments, assets		420.2	304.2
Separate account assets		171,399.8	167,605.6
Investment and universal life contracts		$ (230.0)	(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		$ 7.1	7.1
U.S. government and agencies
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		1,787.5	1,528.8
Non-U.S. governments
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		507.3	507.9
States and political subdivisions
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,295.3	6,676.8
Corporate debt securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		34,750.8	35,810.0
Residential mortgage-backed pass-through securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		3,329.5	3,061.1
Commercial mortgage-backed securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		4,884.1	4,775.5
Collateralized debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		5,873.8	5,403.7
Other debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		8,340.5	7,909.3
Recurring Fair Value Measurements
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		65,768.8	65,673.1
Fixed maturities, trading		786.1	836.2
Equity securities		1,512.8	1,478.1
Derivative instruments, assets		420.2	304.2
Other investments		841.6	815.6
Cash equivalents		3,078.6	3,771.4
Market risk benefit asset		212.3	153.4
Sub-total excluding separate account assets		72,620.4	73,032.0
Separate account assets		171,399.8	167,605.6
Total assets		244,020.2	240,637.6
Investment and universal life contracts		(230.0)	(115.5)
Market risk benefit liability		(69.3)	(133.2)
Funds withheld payable embedded derivative		2,997.0	2,567.1
Derivative liabilities		(480.6)	(494.0)
Other liabilities		(1.9)	(1.0)
Total liabilities		2,215.2	1,823.4
Net assets		246,235.4	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		70.2	73.7
Sub-total excluding separate account assets		70.2	73.7
Separate account assets		8,251.2	8,692.0
Total assets		8,321.4	8,765.7
Net assets		8,321.4	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		1,501.2	1,247.1
Fixed maturities, trading		27.9	27.7
Equity securities		248.3	245.4
Other investments		238.0	220.1
Cash equivalents		323.1	511.6
Sub-total excluding separate account assets		2,338.5	2,251.9
Separate account assets		109,652.4	104,505.0
Total assets		111,990.9	106,756.9
Net assets		111,990.9	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		60,496.6	60,789.2
Fixed maturities, trading		313.0	392.7
Equity securities		1,264.5	1,232.7
Derivative instruments, assets		416.0	297.9
Other investments		359.9	356.7
Cash equivalents		2,755.5	3,259.8
Sub-total excluding separate account assets		65,605.5	66,329.0
Separate account assets		52,777.8	53,655.8
Total assets		118,383.3	119,984.8
Derivative liabilities		(478.4)	(493.2)
Other liabilities		(1.9)	(1.0)
Total liabilities		(480.3)	(494.2)
Net assets		117,903.0	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		3,771.0	3,636.8
Fixed maturities, trading		445.2	415.8
Derivative instruments, assets		4.2	6.3
Other investments		173.5	165.1
Market risk benefit asset		212.3	153.4
Sub-total excluding separate account assets		4,606.2	4,377.4
Separate account assets		718.4	752.8
Total assets		5,324.6	5,130.2
Investment and universal life contracts		(230.0)	(115.5)
Market risk benefit liability		(69.3)	(133.2)
Funds withheld payable embedded derivative		2,997.0	2,567.1
Derivative liabilities		(2.2)	(0.8)
Total liabilities		2,695.5	2,317.6
Net assets		8,020.1	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		1,787.5	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		1,470.9	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		316.6	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		507.3	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		507.3	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		6,295.3	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		6,210.3	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		85.0	69.9
Recurring Fair Value Measurements | Corporate debt securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		34,750.8	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		30.3	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		32,491.9	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		2,228.6	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		3,329.5	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		3,329.5	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		4,884.1	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		4,881.3	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		2.8	3.0
Recurring Fair Value Measurements | Collateralized debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		5,873.8	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		5,769.1	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		104.7	75.4
Recurring Fair Value Measurements | Other debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		8,340.5	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		6,990.6	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		$ 1,349.9	$ 1,182.6
[1] See Note 3, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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