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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions		Mar. 31, 2025	Dec. 31, 2024
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale	[1]	$ 69,726.7	$ 68,251.0
Fixed maturities, trading		1,307.2	1,023.3
Equity securities		2,428.9	2,295.0
Derivative instruments, assets		610.8	648.2
Separate account assets		171,266.2	173,327.1
Investment and universal life contracts		$ (522.7)	(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		1,658.6	1,637.9
Non-U.S. governments
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		494.0	495.7
States and political subdivisions
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,192.9	6,076.5
Corporate debt securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		36,671.5	35,702.6
Residential mortgage-backed pass-through securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		3,763.7	3,674.2
Commercial mortgage-backed securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		5,215.7	5,188.0
Collateralized debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,634.2	6,560.4
Other debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		9,096.1	8,915.7
Recurring Fair Value Measurements
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		69,726.7	68,251.0
Fixed maturities, trading		1,307.2	1,023.3
Equity securities		2,428.9	2,295.0
Mortgage loans			140.6
Derivative instruments, assets		610.8	648.2
Other investments		910.4	905.6
Cash equivalents		2,589.8	2,950.5
Market risk benefit asset		158.7	199.5
Sub-total excluding separate account assets		77,732.5	76,413.7
Separate account assets		171,266.2	173,327.1
Total assets		248,998.7	249,740.8
Investment and universal life contracts		(522.7)	(578.4)
Market risk benefit liability		(80.4)	(62.1)
Funds withheld payable embedded derivative		2,804.8	3,014.5
Long-term debt			(21.8)
Derivative liabilities		(437.3)	(506.2)
Other liabilities		(1.6)	(5.2)
Total liabilities		1,762.8	1,840.8
Net assets		250,761.5	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		109.2	106.7
Sub-total excluding separate account assets		109.2	106.7
Separate account assets		7,091.1	7,573.6
Total assets		7,200.3	7,680.3
Net assets		7,200.3	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		1,290.9	1,261.0
Fixed maturities, trading		0.5
Equity securities		1,130.2	990.2
Other investments		264.4	262.2
Cash equivalents		538.7	271.6
Sub-total excluding separate account assets		3,224.7	2,785.0
Separate account assets		108,513.8	112,920.3
Total assets		111,738.5	115,705.3
Other liabilities		(1.6)	(5.2)
Total liabilities		(1.6)	(5.2)
Net assets		111,736.9	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		64,485.6	63,091.8
Fixed maturities, trading		735.6	460.7
Equity securities		1,298.7	1,304.8
Derivative instruments, assets		606.9	626.8
Other investments		418.2	405.5
Cash equivalents		2,051.1	2,678.9
Sub-total excluding separate account assets		69,596.1	68,568.5
Separate account assets		54,923.1	52,106.5
Total assets		124,519.2	120,675.0
Long-term debt			(21.8)
Derivative liabilities		(431.6)	(498.3)
Total liabilities		(431.6)	(520.1)
Net assets		124,087.6	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		3,950.2	3,898.2
Fixed maturities, trading		571.1	562.6
Mortgage loans			140.6
Derivative instruments, assets		3.9	21.4
Other investments		118.6	131.2
Market risk benefit asset		158.7	199.5
Sub-total excluding separate account assets		4,802.5	4,953.5
Separate account assets		738.2	726.7
Total assets		5,540.7	5,680.2
Investment and universal life contracts		(522.7)	(578.4)
Market risk benefit liability		(80.4)	(62.1)
Funds withheld payable embedded derivative		2,804.8	3,014.5
Derivative liabilities		(5.7)	(7.9)
Total liabilities		2,196.0	2,366.1
Net assets		7,736.7	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		1,658.6	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		1,262.5	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		396.1	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		494.0	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		494.0	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		6,192.9	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		6,124.3	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		68.6	66.8
Recurring Fair Value Measurements | Corporate debt securities
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		36,671.5	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		28.4	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		34,223.8	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		2,419.3	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		3,763.7	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		3,763.7	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		5,215.7	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		5,213.1	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		2.6	2.7
Recurring Fair Value Measurements | Collateralized debt obligations
Assets (liabilities) measured at fair value on a recurring basis
Fixed maturities, available-for-sale		6,634.2	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		6,634.2	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		9,096.1	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		7,636.4	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		$ 1,459.7	$ 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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