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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) $ in Millions	Dec. 31, 2024 USD ($)
Summary of Investments - Other Than Investments in Related Parties
Cost	$ 109,173.2
Amount as shown in the consolidated statement of financial position	103,375.8
Fixed maturities, available-for-sale: | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	74,048.4
Fair value	68,251.0
Amount as shown in the consolidated statement of financial position	68,251.0
Unallocated portfolio layer method basis adjustment, cost	(55.7)
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	1,937.4
Fair value	1,637.9
Amount as shown in the consolidated statement of financial position	1,637.9
States, municipalities and political subdivisions | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	7,207.8
Fair value	6,076.5
Amount as shown in the consolidated statement of financial position	6,076.5
Foreign governments | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	567.3
Fair value	495.7
Amount as shown in the consolidated statement of financial position	495.7
Public utilities | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	5,761.2
Fair value	4,466.3
Amount as shown in the consolidated statement of financial position	4,466.3
Redeemable preferred stock | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	251.7
Fair value	236.7
Amount as shown in the consolidated statement of financial position	236.7
All other corporate bonds | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	32,898.2
Fair value	30,999.6
Amount as shown in the consolidated statement of financial position	30,999.6
Residential mortgage-backed pass-through securities | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	3,881.3
Fair value	3,674.2
Amount as shown in the consolidated statement of financial position	3,674.2
Commercial mortgage-backed securities | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	5,634.3
Fair value	5,188.0
Amount as shown in the consolidated statement of financial position	5,188.0
Collateralized debt obligations | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	6,518.7
Fair value	6,560.4
Amount as shown in the consolidated statement of financial position	6,560.4
Other debt obligations | Available-for-sale
Summary of Investments - Other Than Investments in Related Parties
Cost	9,446.2
Fair value	8,915.7
Amount as shown in the consolidated statement of financial position	8,915.7
Fixed maturities, trading | Trading
Summary of Investments - Other Than Investments in Related Parties
Cost	1,023.3
Fair value	1,023.3
Amount as shown in the consolidated statement of financial position	1,023.3
Equity securities
Summary of Investments - Other Than Investments in Related Parties
Cost	2,295.0
Fair value	2,295.0
Amount as shown in the consolidated statement of financial position	2,295.0
Banks, trust and insurance companies
Summary of Investments - Other Than Investments in Related Parties
Cost	329.2
Fair value	329.2
Amount as shown in the consolidated statement of financial position	329.2
Public utilities
Summary of Investments - Other Than Investments in Related Parties
Cost	0.8
Fair value	0.8
Amount as shown in the consolidated statement of financial position	0.8
Industrial, miscellaneous and all other
Summary of Investments - Other Than Investments in Related Parties
Cost	1,707.9
Fair value	1,707.9
Amount as shown in the consolidated statement of financial position	1,707.9
Other corporate
Summary of Investments - Other Than Investments in Related Parties
Cost	160.7
Fair value	160.7
Amount as shown in the consolidated statement of financial position	160.7
Non-redeemable preferred stock
Summary of Investments - Other Than Investments in Related Parties
Cost	96.4
Fair value	96.4
Amount as shown in the consolidated statement of financial position	96.4
Mortgage loans
Summary of Investments - Other Than Investments in Related Parties
Cost	20,484.2
Amount as shown in the consolidated statement of financial position	20,484.2
Real estate acquired in satisfaction of debt
Summary of Investments - Other Than Investments in Related Parties
Cost	0.8
Amount as shown in the consolidated statement of financial position	0.8
Other real estate
Summary of Investments - Other Than Investments in Related Parties
Cost	2,463.7
Amount as shown in the consolidated statement of financial position	2,463.7
Policy loans
Summary of Investments - Other Than Investments in Related Parties
Cost	867.5
Amount as shown in the consolidated statement of financial position	867.5
Other investments
Summary of Investments - Other Than Investments in Related Parties
Cost	7,990.3
Amount as shown in the consolidated statement of financial position	$ 7,990.3

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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
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-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column D))
-Publisher FASB
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-Section S99
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