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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions		Sep. 30, 2025	Dec. 31, 2024
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale	[1]	$ 71,322.9	$ 68,251.0
Fixed maturities, trading		1,356.8	1,023.3
Equity securities		1,649.0	2,295.0
Derivative instruments, assets		1,037.9	648.2
Separate account assets		189,251.5	173,327.1
Investment and universal life contracts		$ (1,228.8)	(578.4)
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	3.1
U.S. government and agencies
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		1,716.8	1,637.9
Non-U.S. governments
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		518.1	495.7
States and political subdivisions
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,785.5	6,076.5
Corporate debt securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		36,985.2	35,702.6
Residential mortgage-backed pass-through securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		3,716.6	3,674.2
Commercial mortgage-backed securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		5,122.2	5,188.0
Collateralized debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,524.3	6,560.4
Other debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		9,954.2	8,915.7
Recurring Fair Value Measurements
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		71,322.9	68,251.0
Fixed maturities, trading		1,356.8	1,023.3
Equity securities		1,649.0	2,295.0
Mortgage loans			140.6
Derivative instruments, assets		1,037.9	648.2
Other investments		1,057.1	905.6
Cash equivalents		3,528.3	2,950.5
Market risk benefit asset		187.5	199.5
Sub-total excluding separate account assets		80,139.5	76,413.7
Separate account assets		189,251.5	173,327.1
Total assets		269,391.0	249,740.8
Investment and universal life contracts		(1,228.8)	(578.4)
Market risk benefit liability		(69.1)	(62.1)
Funds withheld payable embedded derivative		2,559.2	3,014.5
Long-term debt			(21.8)
Derivative liabilities		(523.2)	(506.2)
Other liabilities		(0.8)	(5.2)
Total liabilities		737.3	1,840.8
Net assets		270,128.3	251,581.6
Recurring Fair Value Measurements | Amount measured at net asset value
Assets (liabilities) measured at fair value on a recurring basis
Other investments		104.7	106.7
Sub-total excluding separate account assets		104.7	106.7
Separate account assets		7,588.2	7,573.6
Total assets		7,692.9	7,680.3
Net assets		7,692.9	7,680.3
Recurring Fair Value Measurements | Fair value hierarchy Level 1
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		1,368.3	1,261.0
Fixed maturities, trading		0.2
Equity securities		252.9	990.2
Other investments		325.1	262.2
Cash equivalents		170.4	271.6
Sub-total excluding separate account assets		2,116.9	2,785.0
Separate account assets		121,409.3	112,920.3
Total assets		123,526.2	115,705.3
Other liabilities		(0.8)	(5.2)
Total liabilities		(0.8)	(5.2)
Net assets		123,525.4	115,700.1
Recurring Fair Value Measurements | Fair value hierarchy Level 2
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		65,737.3	63,091.8
Fixed maturities, trading		856.2	460.7
Equity securities		1,396.1	1,304.8
Derivative instruments, assets		1,024.4	626.8
Other investments		490.8	405.5
Cash equivalents		3,357.9	2,678.9
Sub-total excluding separate account assets		72,862.7	68,568.5
Separate account assets		59,510.6	52,106.5
Total assets		132,373.3	120,675.0
Long-term debt			(21.8)
Derivative liabilities		(514.6)	(498.3)
Total liabilities		(514.6)	(520.1)
Net assets		131,858.7	120,154.9
Recurring Fair Value Measurements | Fair value hierarchy Level 3
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		4,217.3	3,898.2
Fixed maturities, trading		500.4	562.6
Mortgage loans			140.6
Derivative instruments, assets		13.5	21.4
Other investments		136.5	131.2
Market risk benefit asset		187.5	199.5
Sub-total excluding separate account assets		5,055.2	4,953.5
Separate account assets		743.4	726.7
Total assets		5,798.6	5,680.2
Investment and universal life contracts		(1,228.8)	(578.4)
Market risk benefit liability		(69.1)	(62.1)
Funds withheld payable embedded derivative		2,559.2	3,014.5
Derivative liabilities		(8.6)	(7.9)
Total liabilities		1,252.7	2,366.1
Net assets		7,051.3	8,046.3
Recurring Fair Value Measurements | U.S. government and agencies
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		1,716.8	1,637.9
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		1,339.2	1,231.9
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		377.6	406.0
Recurring Fair Value Measurements | Non-U.S. governments
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		518.1	495.7
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		518.1	495.7
Recurring Fair Value Measurements | States and political subdivisions
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,785.5	6,076.5
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		6,717.3	6,009.7
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		68.2	66.8
Recurring Fair Value Measurements | Corporate debt securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		36,985.2	35,702.6
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	29.1
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		34,540.7	33,323.1
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		2,415.4	2,350.4
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		3,716.6	3,674.2
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		3,716.6	3,674.2
Recurring Fair Value Measurements | Commercial mortgage-backed securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		5,122.2	5,188.0
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		5,119.7	5,185.3
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		2.5	2.7
Recurring Fair Value Measurements | Collateralized debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,524.3	6,560.4
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		6,524.3	6,560.4
Recurring Fair Value Measurements | Other debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		9,954.2	8,915.7
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		8,223.0	7,437.4
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		$ 1,731.2	$ 1,478.3
[1] See Note 4, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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