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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Other invested assets: |  |
Company-owned life insurance | $ 217.8 | $ 212.6
Cash and cash equivalents: |  |
Held by variable interest entities | 50.0 | 341.0
Total assets | 37,329.1 | 37,849.3
Key Employee |  |
Other invested assets: |  |
Company-owned life insurance | 191.8 | 189.5
Fair Value, Measurements, Recurring | Total estimated fair value |  |
Assets: |  |
Mortgage loans | 2,752.6 | 2,376.0
Policy loans | 137.6 | 135.3
Other invested assets: |  |
Company-owned life insurance | 409.6 | 402.1
Cash and cash equivalents: |  |
Unrestricted | 766.0 | 1,656.7
Held by variable interest entities | 50.0 | 341.0
Total assets | 4,115.8 | 4,911.1
Liabilities, Fair Value Disclosure [Abstract] |  |
Policyholder account balances (b) | 16,106.6 | 16,122.6
Investment borrowings | 2,442.7 | 2,189.8
Borrowings related to variable interest entities | 355.7 | 499.0
Notes payable – direct corporate obligations | 1,343.4 | 1,837.9
Fair Value, Measurements, Recurring | Total carrying amount |  |
Assets: |  |
Mortgage loans | 2,834.3 | 2,506.3
Policy loans | 137.6 | 135.3
Other invested assets: |  |
Company-owned life insurance | 409.6 | 402.1
Cash and cash equivalents: |  |
Unrestricted | 766.0 | 1,656.7
Held by variable interest entities | 50.0 | 341.0
Total assets | 4,197.5 | 5,041.4
Liabilities, Fair Value Disclosure [Abstract] |  |
Policyholder account balances (b) | 16,106.6 | 16,122.6
Investment borrowings | 2,441.7 | 2,188.8
Borrowings related to variable interest entities | 352.8 | 497.6
Notes payable – direct corporate obligations | 1,334.7 | 1,833.5
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 | 766.0 | 1,656.7
Held by variable interest entities | 50.0 | 341.0
Total assets | 816.0 | 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
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 | 409.6 | 402.1
Cash and cash equivalents: |  |
Unrestricted | 0.0 | 0.0
Held by variable interest entities | 0.0 | 0.0
Total assets | 409.6 | 402.1
Liabilities, Fair Value Disclosure [Abstract] |  |
Policyholder account balances (b) | 0.0 | 0.0
Investment borrowings | 2,442.7 | 2,189.8
Borrowings related to variable interest entities | 355.7 | 499.0
Notes payable – direct corporate obligations | 1,343.4 | 1,837.9
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |
Assets: |  |
Mortgage loans | 2,752.6 | 2,376.0
Policy loans | 137.6 | 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 | 2,890.2 | 2,511.3
Liabilities, Fair Value Disclosure [Abstract] |  |
Policyholder account balances (b) | 16,106.6 | 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

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