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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Other invested assets:    
Company-owned life insurance $ 220.3 $ 212.6
Cash and cash equivalents:    
Held by variable interest entities 23.3 341.0
Total assets 38,296.2 37,849.3
Liabilities, Fair Value Disclosure [Abstract]    
Total liabilities 35,685.2 35,334.1
Key Employee    
Other invested assets:    
Company-owned life insurance 193.3 189.5
Fair Value, Measurements, Recurring | Total estimated fair value    
Assets:    
Mortgage loans 2,943.1 2,376.0
Policy loans 141.2 135.3
Other invested assets:    
Company-owned life insurance 413.6 402.1
Cash and cash equivalents:    
Unrestricted 1,218.3 1,656.7
Held by variable interest entities 23.3 341.0
Total assets 4,739.5 4,911.1
Liabilities, Fair Value Disclosure [Abstract]    
Policyholder account balances (b) 16,691.9 16,122.6
Investment borrowings 2,443.3 2,189.8
Borrowings related to variable interest entities 277.4 499.0
Notes payable – direct corporate obligations 1,374.0 1,837.9
Total liabilities 20,786.6 20,649.3
Fair Value, Measurements, Recurring | Total carrying amount    
Assets:    
Mortgage loans 3,042.7 2,506.3
Policy loans 141.2 135.3
Other invested assets:    
Company-owned life insurance 413.6 402.1
Cash and cash equivalents:    
Unrestricted 1,218.3 1,656.7
Held by variable interest entities 23.3 341.0
Total assets 4,839.1 5,041.4
Liabilities, Fair Value Disclosure [Abstract]    
Policyholder account balances (b) 16,691.9 16,122.6
Investment borrowings 2,441.7 2,188.8
Borrowings related to variable interest entities 274.3 497.6
Notes payable – direct corporate obligations 1,335.2 1,833.5
Total liabilities 20,743.1 20,642.5
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1)    
Assets:    
Mortgage loans 0.0 0.0
Policy loans 0.0 0.0
Other invested assets:    
Company-owned life insurance 0.0 0.0
Cash and cash equivalents:    
Unrestricted 1,218.3 1,656.7
Held by variable interest entities 23.3 341.0
Total assets 1,241.6 1,997.7
Liabilities, Fair Value Disclosure [Abstract]    
Policyholder account balances (b) 0.0 0.0
Investment borrowings 0.0 0.0
Borrowings related to variable interest entities 0.0 0.0
Notes payable – direct corporate obligations 0.0 0.0
Total liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets:    
Mortgage loans 0.0 0.0
Policy loans 0.0 0.0
Other invested assets:    
Company-owned life insurance 413.6 402.1
Cash and cash equivalents:    
Unrestricted 0.0 0.0
Held by variable interest entities 0.0 0.0
Total assets 413.6 402.1
Liabilities, Fair Value Disclosure [Abstract]    
Policyholder account balances (b) 0.0 0.0
Investment borrowings 2,443.3 2,189.8
Borrowings related to variable interest entities 277.4 499.0
Notes payable – direct corporate obligations 1,374.0 1,837.9
Total liabilities 4,094.7 4,526.7
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3)    
Assets:    
Mortgage loans 2,943.1 2,376.0
Policy loans 141.2 135.3
Other invested assets:    
Company-owned life insurance 0.0 0.0
Cash and cash equivalents:    
Unrestricted 0.0 0.0
Held by variable interest entities 0.0 0.0
Total assets 3,084.3 2,511.3
Liabilities, Fair Value Disclosure [Abstract]    
Policyholder account balances (b) 16,691.9 16,122.6
Investment borrowings 0.0 0.0
Borrowings related to variable interest entities 0.0 0.0
Notes payable – direct corporate obligations 0.0 0.0
Total liabilities $ 16,691.9 $ 16,122.6