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Fair Value Measurements - Financial Instruments Not Reported at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets (liabilities) |  |
Mortgage loans | $ 20,142.8 | $ 20,629.8
Policy loans | 809.3 | 784.7
Reinsurance deposit receivable | 6,078.6 | 7,901.0
Short-term debt | (61.1) | (80.7)
Long-term debt | (3,930.9) | (3,997.0)
Carrying amount |  |
Assets (liabilities) |  |
Mortgage loans | 20,142.8 | 20,629.8
Policy loans | 809.3 | 784.7
Other investments | 268.6 | 250.6
Cash and cash equivalents not required to be reported at fair value | 936.3 | 1,243.9
Reinsurance deposit receivable | 6,078.6 | 7,901.0
Cash collateral receivable | 38.7 | 281.0
Investment contracts | (33,937.9) | (35,380.1)
Short-term debt | (61.1) | (80.7)
Long-term debt | (3,930.9) | (3,997.0)
Separate account liabilities | (152,229.2) | (141,459.3)
Bank deposits | (399.5) | (352.4)
Cash collateral payable | (176.9) | (291.3)
Assets (liabilities) measured at fair value |  |
Assets (liabilities) |  |
Mortgage loans | 18,505.0 | 18,754.5
Policy loans | 846.3 | 804.0
Other investments | 260.9 | 238.0
Cash and cash equivalents not required to be reported at fair value | 936.3 | 1,243.9
Reinsurance deposit receivable | 5,487.7 | 6,859.9
Cash collateral receivable | 38.7 | 281.0
Investment contracts | (32,166.7) | (32,367.4)
Short-term debt | (61.1) | (80.7)
Long-term debt | (3,754.5) | (3,680.6)
Separate account liabilities | (151,280.9) | (140,533.9)
Bank deposits | (385.3) | (336.3)
Cash collateral payable | (176.9) | (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 | 913.9 | 1,232.5
Cash collateral receivable | 38.7 | 281.0
Cash collateral payable | (176.9) | (291.3)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 2 |  |
Assets (liabilities) |  |
Other investments | 142.9 | 133.5
Cash and cash equivalents not required to be reported at fair value | 22.4 | 11.4
Investment contracts | (7,828.1) | (7,279.0)
Short-term debt | (61.1) | (80.7)
Long-term debt | (3,754.1) | (3,620.1)
Bank deposits | (385.3) | (336.3)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 3 |  |
Assets (liabilities) |  |
Mortgage loans | 18,505.0 | 18,754.5
Policy loans | 846.3 | 804.0
Other investments | 118.0 | 104.5
Reinsurance deposit receivable | 5,487.7 | 6,859.9
Investment contracts | (24,338.6) | (25,088.4)
Long-term debt | (0.4) | (60.5)
Separate account liabilities | $ (151,280.9) | $ (140,533.9)

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(e)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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