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Income Taxes - Deferred Income Taxes and Other (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Deferred income tax assets:      
Insurance liabilities     $ 552.4
Net operating and capital loss carryforwards   $ 68.2 69.2
Tax credit carryforwards     4.6
Employee benefits   377.9 389.1
Other deferred income tax assets     62.2
Gross deferred income tax assets   446.1 1,077.5
Valuation allowance   (28.0) (18.4)
Total deferred income tax assets   418.1 1,059.1
Deferred income tax liabilities:      
Deferred income tax liabilities: Deferred acquisition costs   (582.3) (522.6)
Investments, including derivative assets   (304.2) (402.0)
Net unrealized gains on available-for-sale securities   (1,118.1) (1,762.1)
Deferred income tax liabilities: Real estate   (141.6) (158.5)
Intangible assets   (408.0) (387.5)
Insurance liabilities   (44.2)  
Other deferred income tax liabilities   (54.9) (43.4)
Total deferred income tax liabilities   (2,653.3) (3,276.1)
Total net deferred income tax liabilities   (2,235.2) (2,217.0)
Net deferred income taxes by jurisdiction      
Net deferred income tax assets   85.0 113.8
Net deferred income tax liabilities   (2,320.2) (2,330.8)
Total net deferred income tax liabilities   (2,235.2) (2,217.0)
Deferred income tax disclosures      
Adjustments to deferred tax assets and liabilities $ 11.1    
Accumulated but undistributed earnings from operations of foreign subsidiaries for which U.S. federal and state deferred income taxes have not been provided   912.8 997.4
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   (12.7) (54.6)
U.S. Federal      
Deferred income tax assets:      
Tax credit carryforwards   0.0 4.6
Net deferred income taxes by jurisdiction      
Net deferred income tax liabilities   (2,023.6) (2,011.8)
State      
Net deferred income taxes by jurisdiction      
Net deferred income tax assets   61.2 81.1
Deferred income tax disclosures-operating loss carryforwards      
Net operating loss carryforwards   267.3 269.5
Foreign      
Net deferred income taxes by jurisdiction      
Net deferred income tax assets   23.8 32.7
Net deferred income tax liabilities   (296.6) (319.0)
Deferred income tax disclosures-operating loss carryforwards      
Net operating loss carryforwards   164.1 170.3
Valuation allowances on income tax benefits primarily associated with foreign net operating loss carryforwards   $ 28.0 $ 18.4