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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Summary of Investments - Other Than Investments in Related Parties  
Cost $ 103,621.3
Amount as shown in the Consolidated Statement of Financial Position 108,905.9
Fixed maturities | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 72,869.9
Value 78,154.5
Amount as shown in the Consolidated Statement of Financial Position 78,154.5
Fixed maturities | Trading  
Summary of Investments - Other Than Investments in Related Parties  
Cost 422.2
Value 422.2
Amount as shown in the Consolidated Statement of Financial Position 422.2
U.S. government and agencies | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 1,978.0
Value 2,088.6
Amount as shown in the Consolidated Statement of Financial Position 2,088.6
States and political subdivisions | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 8,290.7
Value 9,304.4
Amount as shown in the Consolidated Statement of Financial Position 9,304.4
Non-U.S. governments | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 851.0
Value 982.0
Amount as shown in the Consolidated Statement of Financial Position 982.0
Public utilities | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 5,226.7
Value 5,695.8
Amount as shown in the Consolidated Statement of Financial Position 5,695.8
Redeemable preferred stock | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 99.1
Value 101.0
Amount as shown in the Consolidated Statement of Financial Position 101.0
All other corporate bonds | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 36,813.4
Value 40,147.6
Amount as shown in the Consolidated Statement of Financial Position 40,147.6
Residential mortgage-backed pass-through securities | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 3,122.3
Value 3,152.9
Amount as shown in the Consolidated Statement of Financial Position 3,152.9
Commercial mortgage-backed securities | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 5,436.2
Value 5,562.2
Amount as shown in the Consolidated Statement of Financial Position 5,562.2
Collateralized debt obligations | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 3,564.7
Value 3,559.6
Amount as shown in the Consolidated Statement of Financial Position 3,559.6
Other debt obligations | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 7,487.8
Value 7,560.4
Amount as shown in the Consolidated Statement of Financial Position 7,560.4
Equity securities  
Summary of Investments - Other Than Investments in Related Parties  
Cost 2,347.2
Value 2,347.2
Amount as shown in the Consolidated Statement of Financial Position 2,347.2
Common stocks: Banks, trust and insurance companies  
Summary of Investments - Other Than Investments in Related Parties  
Cost 886.9
Value 886.9
Amount as shown in the Consolidated Statement of Financial Position 886.9
Common stocks: Public Utilities  
Summary of Investments - Other Than Investments in Related Parties  
Cost 7.5
Value 7.5
Amount as shown in the Consolidated Statement of Financial Position 7.5
Common stocks: Industrial, miscellaneous and all other  
Summary of Investments - Other Than Investments in Related Parties  
Cost 854.7
Value 854.7
Amount as shown in the Consolidated Statement of Financial Position 854.7
Other corporate  
Summary of Investments - Other Than Investments in Related Parties  
Cost 465.2
Value 465.2
Amount as shown in the Consolidated Statement of Financial Position 465.2
Non-redeemable preferred stock  
Summary of Investments - Other Than Investments in Related Parties  
Cost 132.9
Value 132.9
Amount as shown in the Consolidated Statement of Financial Position 132.9
Mortgage loans  
Summary of Investments - Other Than Investments in Related Parties  
Cost 19,668.7
Amount as shown in the Consolidated Statement of Financial Position 19,668.7
Real estate acquired in satisfaction of debt  
Summary of Investments - Other Than Investments in Related Parties  
Cost 14.8
Amount as shown in the Consolidated Statement of Financial Position 14.8
Other real estate  
Summary of Investments - Other Than Investments in Related Parties  
Cost 2,060.6
Amount as shown in the Consolidated Statement of Financial Position 2,060.6
Policy loans  
Summary of Investments - Other Than Investments in Related Parties  
Cost 759.6
Amount as shown in the Consolidated Statement of Financial Position 759.6
Investments: Other investments  
Summary of Investments - Other Than Investments in Related Parties  
Cost 5,478.3
Amount as shown in the Consolidated Statement of Financial Position $ 5,478.3