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Income Taxes - Deferred Income Taxes and Other (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
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