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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Summary of Investments - Other Than Investments in Related Parties  
Cost $ 102,462.5
Amount as shown in the Consolidated Statement of Financial Position 95,089.3
Fixed maturities | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 70,263.1
Value 62,889.9
Amount as shown in the Consolidated Statement of Financial Position 62,889.9
Fixed maturities | Trading  
Summary of Investments - Other Than Investments in Related Parties  
Cost 760.7
Value 760.7
Amount as shown in the Consolidated Statement of Financial Position 760.7
U.S. government and agencies | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 1,990.9
Value 1,739.8
Amount as shown in the Consolidated Statement of Financial Position 1,739.8
States and political subdivisions | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 7,355.4
Value 6,232.3
Amount as shown in the Consolidated Statement of Financial Position 6,232.3
Non-U.S. governments | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 611.2
Value 567.3
Amount as shown in the Consolidated Statement of Financial Position 567.3
Public utilities | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 5,442.8
Value 4,783.0
Amount as shown in the Consolidated Statement of Financial Position 4,783.0
Redeemable preferred stock | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 157.6
Value 128.1
Amount as shown in the Consolidated Statement of Financial Position 128.1
All other corporate bonds | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 34,770.0
Value 31,272.1
Amount as shown in the Consolidated Statement of Financial Position 31,272.1
Residential mortgage-backed pass-through securities | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 2,420.6
Value 2,228.7
Amount as shown in the Consolidated Statement of Financial Position 2,228.7
Commercial mortgage-backed securities | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 5,572.2
Value 4,864.6
Amount as shown in the Consolidated Statement of Financial Position 4,864.6
Collateralized debt obligations | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 4,705.6
Value 4,566.4
Amount as shown in the Consolidated Statement of Financial Position 4,566.4
Other debt obligations | Available-for-sale  
Summary of Investments - Other Than Investments in Related Parties  
Cost 7,236.8
Value 6,507.6
Amount as shown in the Consolidated Statement of Financial Position 6,507.6
Equity securities  
Summary of Investments - Other Than Investments in Related Parties  
Cost 1,708.6
Value 1,708.6
Amount as shown in the Consolidated Statement of Financial Position 1,708.6
Common stocks: Banks, trust and insurance companies  
Summary of Investments - Other Than Investments in Related Parties  
Cost 363.7
Value 363.7
Amount as shown in the Consolidated Statement of Financial Position 363.7
Common stocks: Public Utilities  
Summary of Investments - Other Than Investments in Related Parties  
Cost 0.2
Value 0.2
Amount as shown in the Consolidated Statement of Financial Position 0.2
Common stocks: Industrial, miscellaneous and all other  
Summary of Investments - Other Than Investments in Related Parties  
Cost 809.8
Value 809.8
Amount as shown in the Consolidated Statement of Financial Position 809.8
Other corporate  
Summary of Investments - Other Than Investments in Related Parties  
Cost 420.1
Value 420.1
Amount as shown in the Consolidated Statement of Financial Position 420.1
Non-redeemable preferred stock  
Summary of Investments - Other Than Investments in Related Parties  
Cost 114.8
Value 114.8
Amount as shown in the Consolidated Statement of Financial Position 114.8
Mortgage loans  
Summary of Investments - Other Than Investments in Related Parties  
Cost 20,629.8
Amount as shown in the Consolidated Statement of Financial Position 20,629.8
Real estate acquired in satisfaction of debt  
Summary of Investments - Other Than Investments in Related Parties  
Cost 2.3
Amount as shown in the Consolidated Statement of Financial Position 2.3
Other real estate  
Summary of Investments - Other Than Investments in Related Parties  
Cost 2,237.4
Amount as shown in the Consolidated Statement of Financial Position 2,237.4
Policy loans  
Summary of Investments - Other Than Investments in Related Parties  
Cost 784.7
Amount as shown in the Consolidated Statement of Financial Position 784.7
Investments: Other investments  
Summary of Investments - Other Than Investments in Related Parties  
Cost 6,075.9
Amount as shown in the Consolidated Statement of Financial Position $ 6,075.9