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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) $ in Millions	Dec. 31, 2023 USD ($)
Summary of Investments - Other Than Investments in Related Parties
Cost	$ 103,428.7
Amount as shown in the consolidated statement of financial position	98,320.4
Fixed maturities, available-for-sale: | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	70,781.4
Fair value	65,673.1
Amount as shown in the consolidated statement of financial position	65,673.1
Fixed maturities, available-for-sale: | Trading
Summary of Investments - Other Than Investments in Related Parties
Cost	836.2
Fair value	836.2
Amount as shown in the consolidated statement of financial position	836.2
U.S. Treasury securities and obligations of U.S. government corporations and agencies | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	1,745.3
Fair value	1,528.8
Amount as shown in the consolidated statement of financial position	1,528.8
States, municipalities and political subdivisions | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	7,566.4
Fair value	6,676.8
Amount as shown in the consolidated statement of financial position	6,676.8
Foreign governments | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	550.3
Fair value	507.9
Amount as shown in the consolidated statement of financial position	507.9
Public utilities | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	5,532.7
Fair value	5,039.6
Amount as shown in the consolidated statement of financial position	5,039.6
Redeemable preferred stock | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	225.4
Fair value	208.4
Amount as shown in the consolidated statement of financial position	208.4
All other corporate bonds | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	32,673.2
Fair value	30,562.0
Amount as shown in the consolidated statement of financial position	30,562.0
Residential mortgage-backed pass-through securities | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	3,199.7
Fair value	3,061.1
Amount as shown in the consolidated statement of financial position	3,061.1
Commercial mortgage-backed securities | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	5,428.6
Fair value	4,775.5
Amount as shown in the consolidated statement of financial position	4,775.5
Collateralized debt obligations | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	5,386.0
Fair value	5,403.7
Amount as shown in the consolidated statement of financial position	5,403.7
Other debt obligations | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	8,473.8
Fair value	7,909.3
Amount as shown in the consolidated statement of financial position	7,909.3
Equity securities:
Summary of Investments - Other Than Investments in Related Parties
Cost	1,478.1
Fair value	1,478.1
Amount as shown in the consolidated statement of financial position	1,478.1
Banks, trust and insurance companies
Summary of Investments - Other Than Investments in Related Parties
Cost	340.0
Fair value	340.0
Amount as shown in the consolidated statement of financial position	340.0
Industrial, miscellaneous and all other
Summary of Investments - Other Than Investments in Related Parties
Cost	858.9
Fair value	858.9
Amount as shown in the consolidated statement of financial position	858.9
Other corporate
Summary of Investments - Other Than Investments in Related Parties
Cost	160.1
Fair value	160.1
Amount as shown in the consolidated statement of financial position	160.1
Non-redeemable preferred stock
Summary of Investments - Other Than Investments in Related Parties
Cost	119.1
Fair value	119.1
Amount as shown in the consolidated statement of financial position	119.1
Mortgage loans
Summary of Investments - Other Than Investments in Related Parties
Cost	20,142.8
Amount as shown in the consolidated statement of financial position	20,142.8
Real estate acquired in satisfaction of debt
Summary of Investments - Other Than Investments in Related Parties
Cost	1.9
Amount as shown in the consolidated statement of financial position	1.9
Other real estate
Summary of Investments - Other Than Investments in Related Parties
Cost	2,343.4
Amount as shown in the consolidated statement of financial position	2,343.4
Policy loans
Summary of Investments - Other Than Investments in Related Parties
Cost	809.3
Amount as shown in the consolidated statement of financial position	809.3
Other investments
Summary of Investments - Other Than Investments in Related Parties
Cost	7,035.6
Amount as shown in the consolidated statement of financial position	$ 7,035.6

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 15
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-7

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Amount of investment held by insurance company, excluding investment in related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column D))
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column B))
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