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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill by reporting segment for the year ended December 31, 2023 were as follows:
($ in millions)Property & CasualtyLife & RetirementSupplemental & Group Benefits Total
Balance as of January 1, 2021
Goodwill$9.5 $48.0 $19.6 $77.1 
Accumulated impairment losses — (33.6)— (33.6)
Total goodwill, net 9.5 14.4 19.6 43.5 
Acquisitions — — — — 
Impairments— — — — 
Balance as of December 31, 2021
Goodwill9.5 48.0 19.6 77.1 
Accumulated impairment losses— (33.6)— (33.6)
Total goodwill, net9.5 14.4 19.6 43.5 
Acquisitions— — 12.8 12.8 
Impairments— (2.0)— (2.0)
Balance as of December 31, 2022
Goodwill9.5 48.0 32.4 89.9 
Accumulated impairment losses — (35.6)— (35.6)
Total goodwill, net9.5 12.4 32.4 54.3 
Acquisitions — — — — 
Impairments— — — — 
Balance as of December 31, 2023
Goodwill9.5 48.0 32.4 89.9 
Accumulated impairment losses— (35.6)— (35.6)
Total goodwill, net$9.5 $12.4 $32.4 $54.3 
Summary of Finite-Lived Intangible Assets As of December 31, 2023 the outstanding amounts of definite-lived intangible assets subject to amortization were as follows:
($ in millions)Weighted Average
Useful Life (in Years)
At inception:
Value of business acquired
28$100.1 
Value of distribution acquired
1754.0 
Value of agency relationships
1417.0 
Value of customer relationships
1059.9 
Total
20231.0 
Accumulated amortization and impairments:
Value of business acquired
(35.3)
Value of distribution acquired
(17.5)
Value of agency relationships
(9.8)
Value of customer relationships
(11.5)
Total
(74.1)
Net intangible assets subject to amortization:$156.9 
Future Amortization Expense
Estimated future amortization of the Company's definite-lived intangible assets were as follows:
($ in millions)
Year Ending December 31,
2024
$14.5 
2025
14.3 
2026
14.2 
2027
14.1 
2028
14.1 
Thereafter
85.7 
Total
$156.9 
Summary of Indefinite-Lived Intangible Assets
Indefinite-lived intangible assets (not subject to amortization) as of December 31, 2023 were as follows:
($ in millions)Trade Names
State Licenses
Total
Balance as of January 1, 2021
$7.9 $2.9 $10.8 
Impairments— — — 
Acquisitions— — — 
Balance as of December 31, 2021
7.9 2.9 10.8 
Impairments(0.3)— (0.3)
Acquisitions— 2.9 2.9 
Balance as of December 31, 2022
7.6 5.8 13.4 
Impairments— — — 
Acquisitions— — — 
Balance as of December 31, 2023$7.6 $5.8 $13.4