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Fair Value Measurements - Financial Instruments Not Reported at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets (liabilities)
Mortgage loans	$ 19,668.7	$ 17,343.0
Policy loans	759.6	784.0
Short-term debt	(79.8)	(84.7)
Long-term debt	(4,280.2)	(4,279.2)
Carrying amount
Assets (liabilities)
Mortgage loans	19,668.7	17,343.0
Policy loans	759.6	784.0
Other investments	304.0	347.2
Cash and cash equivalents not required to be reported at fair value	1,214.2	1,383.4
Investment contracts	(35,810.4)	(35,449.9)
Short-term debt	(79.8)	(84.7)
Long-term debt	(4,280.2)	(4,279.2)
Separate account liabilities	(165,098.7)	(160,316.4)
Bank deposits	(373.3)	(423.5)
Cash collateral payable	(214.9)	(224.6)
Assets (liabilities) measured at fair value
Assets (liabilities)
Mortgage loans	20,602.7	18,762.6
Policy loans	952.9	1,037.7
Other investments	294.8	338.5
Cash and cash equivalents not required to be reported at fair value	1,214.2	1,383.4
Investment contracts	(36,088.6)	(36,738.7)
Short-term debt	(79.8)	(84.7)
Long-term debt	(4,793.1)	(4,949.9)
Separate account liabilities	(164,028.9)	(159,129.2)
Bank deposits	(372.8)	(429.7)
Cash collateral payable	(214.9)	(224.6)
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	1,197.8	1,369.7
Cash collateral payable	(214.9)	(224.6)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 2
Assets (liabilities)
Other investments	198.6	247.1
Cash and cash equivalents not required to be reported at fair value	16.4	13.7
Investment contracts	(7,454.3)	(5,276.9)
Short-term debt	(79.8)	(84.7)
Long-term debt	(4,755.1)	(4,908.7)
Bank deposits	(372.8)	(429.7)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 3
Assets (liabilities)
Mortgage loans	20,602.7	18,762.6
Policy loans	952.9	1,037.7
Other investments	96.2	91.4
Investment contracts	(28,634.3)	(31,461.8)
Long-term debt	(38.0)	(41.2)
Separate account liabilities	$ (164,028.9)	$ (159,129.2)

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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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