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Income Taxes - Deferred Income Taxes and Other (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Deferred income tax assets: |  |
Net operating and capital loss carryforwards | $ 123.0 | $ 86.1
Tax credit carryforwards | 64.2 | 65.8
Net unrealized losses on available-for-sale securities | 1,092.9 | 1,572.3
Employee benefits | 315.4 | 305.3
Gross deferred income tax assets | 1,595.5 | 2,029.5
Valuation allowance | (58.8) | (42.9)
Total deferred income tax assets | 1,536.7 | 1,986.6
Deferred income tax liabilities: |  |
Deferred income tax liabilities: Deferred acquisition costs | (679.2) | (639.6)
Investments, including derivative assets | (240.9) | (224.7)
Funds withheld embedded derivative | (575.5) | (767.1)
Deferred income tax liabilities: Real estate | (136.7) | (141.0)
Intangible assets | (384.2) | (386.9)
Insurance liabilities | (886.1) | (814.3)
Other deferred income tax liabilities | (6.3) | (30.3)
Total deferred income tax liabilities | (2,908.9) | (3,003.9)
Total net deferred income tax liabilities | (1,372.2) | (1,017.3)
Net deferred income taxes by jurisdiction |  |
Net deferred income tax assets | 241.1 | 306.9
Net deferred income tax liabilities | (1,613.3) | (1,324.2)
Total net deferred income tax liabilities | (1,372.2) | (1,017.3)
Deferred income tax disclosures-operating loss carryforwards |  |
Valuation allowances on income tax benefits primarily associated with foreign net operating loss carryforwards | 58.8 | 42.9
Deferred income tax disclosures |  |
Accumulated but undistributed earnings from operations of foreign subsidiaries for which U.S. federal and state deferred income taxes have not been provided | 1,362.6 | 1,089.0
Excess book carrying value over tax basis with respect to the original investment of foreign subsidiaries for which U.S. federal and state deferred income taxes have not been provided | 106.2 |
Current income tax receivables associated with outstanding audit issues |  |
Current income tax receivables (payables) associated with outstanding audit issues | 223.8 | 5.6
U.S. Federal |  |
Net deferred income taxes by jurisdiction |  |
Net deferred income tax liabilities | (1,312.9) | (1,051.0)
Deferred income tax disclosures-operating loss carryforwards |  |
Net operating and capital loss carryforwards | 155.2 | 66.1
State |  |
Net deferred income taxes by jurisdiction |  |
Net deferred income tax assets | 77.9 | 83.1
Deferred income tax disclosures-operating loss carryforwards |  |
Net operating loss carryforwards | 312.3 | 250.0
Foreign |  |
Net deferred income taxes by jurisdiction |  |
Net deferred income tax assets | 163.2 | 223.8
Net deferred income tax liabilities | (300.4) | (273.2)
Deferred income tax disclosures-operating loss carryforwards |  |
Net operating loss carryforwards | $ 257.3 | $ 229.5

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