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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Other invested assets:    
Company-owned life insurance $ 222.8 $ 222.3
Cash and cash equivalents:    
Held by variable interest entities 24.8 27.4
Total assets 38,963.4 38,790.6
Liabilities, Fair Value Disclosure [Abstract]    
Total liabilities 36,465.0 36,152.4
Key Employee    
Other invested assets:    
Company-owned life insurance 201.8 198.6
Fair Value, Measurements, Recurring | Total estimated fair value    
Assets:    
Mortgage loans 3,280.4 3,196.9
Policy loans 141.8 140.9
Other invested assets:    
Company-owned life insurance 424.6 420.9
Cash and cash equivalents:    
Unrestricted 1,129.5 956.1
Held by variable interest entities 24.8 27.4
Total assets 5,001.1 4,742.2
Liabilities, Fair Value Disclosure [Abstract]    
Policyholder account balances 17,433.1 17,312.0
Investment borrowings 2,693.1 2,443.2
Borrowings related to variable interest entities 275.7 277.1
Notes payable – direct corporate obligations 1,334.9 1,365.7
Total liabilities 21,736.8 21,398.0
Fair Value, Measurements, Recurring | Total carrying amount    
Assets:    
Mortgage loans 3,347.8 3,256.8
Policy loans 141.8 140.9
Other invested assets:    
Company-owned life insurance 424.6 420.9
Cash and cash equivalents:    
Unrestricted 1,129.5 956.1
Held by variable interest entities 24.8 27.4
Total assets 5,068.5 4,802.1
Liabilities, Fair Value Disclosure [Abstract]    
Policyholder account balances 17,433.1 17,312.0
Investment borrowings 2,691.7 2,441.7
Borrowings related to variable interest entities 274.4 274.4
Notes payable – direct corporate obligations 1,336.0 1,335.6
Total liabilities 21,735.2 21,363.7
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 1,129.5 956.1
Held by variable interest entities 24.8 27.4
Total assets 1,154.3 983.5
Liabilities, Fair Value Disclosure [Abstract]    
Policyholder account balances 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 424.6 420.9
Cash and cash equivalents:    
Unrestricted 0.0 0.0
Held by variable interest entities 0.0 0.0
Total assets 424.6 420.9
Liabilities, Fair Value Disclosure [Abstract]    
Policyholder account balances 0.0 0.0
Investment borrowings 2,693.1 2,443.2
Borrowings related to variable interest entities 275.7 277.1
Notes payable – direct corporate obligations 0.0 1,365.7
Total liabilities 2,968.8 4,086.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3)    
Assets:    
Mortgage loans 3,280.4 3,196.9
Policy loans 141.8 140.9
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 3,422.2 3,337.8
Liabilities, Fair Value Disclosure [Abstract]    
Policyholder account balances 17,433.1 17,312.0
Investment borrowings 0.0 0.0
Borrowings related to variable interest entities 0.0 0.0
Notes payable – direct corporate obligations 1,334.9 0.0
Total liabilities $ 18,768.0 $ 17,312.0