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Fair Value Measurements - Financial Instruments Not Reported at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Assets (liabilities)
Mortgage loans	$ 20,681.2	$ 20,484.2
Policy loans	870.7	867.5
Reinsurance deposit receivable	4,295.8	4,897.5
Short-term debt	(13.0)	(152.7)
Long-term debt	(3,924.6)	(3,955.3)
Carrying amount
Assets (liabilities)
Mortgage loans	20,681.2	20,343.6
Policy loans	870.7	867.5
Other investments	240.5	294.9
Cash and cash equivalents not required to be reported at fair value	1,608.8	1,261.4
Reinsurance deposit receivable	4,295.8	4,897.5
Cash collateral receivable	5.7	3.0
Investment contracts	(33,750.0)	(34,140.3)
Short-term debt	(13.0)	(152.7)
Long-term debt	(3,924.6)	(3,933.5)
Separate account liabilities	(173,631.7)	(157,939.3)
Bank deposits	(436.1)	(440.4)
Cash collateral payable	(722.6)	(428.9)
Assets (liabilities) measured at fair value
Assets (liabilities)
Mortgage loans	19,430.9	18,466.5
Policy loans	917.5	879.3
Other investments	245.2	292.4
Cash and cash equivalents not required to be reported at fair value	1,608.8	1,261.4
Reinsurance deposit receivable	4,045.7	4,401.9
Cash collateral receivable	5.7	3.0
Investment contracts	(33,246.2)	(32,922.2)
Short-term debt	(13.0)	(152.7)
Long-term debt	(3,835.2)	(3,715.7)
Separate account liabilities	(172,668.4)	(157,010.7)
Bank deposits	(440.2)	(442.1)
Cash collateral payable	(722.6)	(428.9)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 1
Assets (liabilities)
Cash and cash equivalents not required to be reported at fair value	1,577.7	1,238.5
Cash collateral receivable	5.7	3.0
Cash collateral payable	(722.6)	(428.9)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 2
Assets (liabilities)
Other investments	57.3	127.5
Cash and cash equivalents not required to be reported at fair value	31.1	22.9
Investment contracts	(8,158.0)	(8,306.5)
Short-term debt	(13.0)	(152.7)
Long-term debt	(3,832.6)	(3,713.2)
Bank deposits	(440.2)	(442.1)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 3
Assets (liabilities)
Mortgage loans	19,430.9	18,466.5
Policy loans	917.5	879.3
Other investments	187.9	164.9
Reinsurance deposit receivable	4,045.7	4,401.9
Investment contracts	(25,088.2)	(24,615.7)
Long-term debt	(2.6)	(2.5)
Separate account liabilities	$ (172,668.4)	$ (157,010.7)

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Amount before allowance of loans made to policy and contract holders using their life insurance contracts' cash value or separate accounts as collateral. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums over and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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