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Fair Value Measurements - Financial Instruments Not Reported at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Assets (liabilities)
Mortgage loans	$ 20,409.3	$ 20,629.8
Policy loans	807.2	784.7
Reinsurance deposit receivable	6,961.3	7,901.0
Short-term debt	(26.3)	(80.7)
Long-term debt	(3,992.9)	(3,997.0)
Carrying amount
Assets (liabilities)
Mortgage loans	20,409.3	20,629.8
Policy loans	807.2	784.7
Other investments	289.7	250.6
Cash and cash equivalents not required to be reported at fair value	1,471.0	1,243.9
Reinsurance deposit receivable	6,961.3	7,901.0
Cash collateral receivable	15.5	281.0
Investment contracts	(34,975.8)	(35,380.1)
Short-term debt	(26.3)	(80.7)
Long-term debt	(3,992.9)	(3,997.0)
Separate account liabilities	(149,283.7)	(141,459.3)
Bank deposits	(381.5)	(352.4)
Cash collateral payable	(275.4)	(291.3)
Assets (liabilities) measured at fair value
Assets (liabilities)
Mortgage loans	18,454.7	18,754.5
Policy loans	844.5	804.0
Other investments	288.3	238.0
Cash and cash equivalents not required to be reported at fair value	1,471.0	1,243.9
Reinsurance deposit receivable	6,007.9	6,859.9
Cash collateral receivable	15.5	281.0
Investment contracts	(32,137.7)	(32,367.4)
Short-term debt	(26.3)	(80.7)
Long-term debt	(3,645.8)	(3,680.6)
Separate account liabilities	(148,337.6)	(140,533.9)
Bank deposits	(363.2)	(336.3)
Cash collateral payable	(275.4)	(291.3)
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	1,444.9	1,232.5
Cash collateral receivable	15.5	281.0
Cash collateral payable	(275.4)	(291.3)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 2
Assets (liabilities)
Other investments	166.9	133.5
Cash and cash equivalents not required to be reported at fair value	26.1	11.4
Investment contracts	(7,307.1)	(7,279.0)
Short-term debt	(26.3)	(80.7)
Long-term debt	(3,587.0)	(3,620.1)
Bank deposits	(363.2)	(336.3)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 3
Assets (liabilities)
Mortgage loans	18,454.7	18,754.5
Policy loans	844.5	804.0
Other investments	121.4	104.5
Reinsurance deposit receivable	6,007.9	6,859.9
Investment contracts	(24,830.6)	(25,088.4)
Long-term debt	(58.8)	(60.5)
Separate account liabilities	$ (148,337.6)	$ (140,533.9)

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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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