NOTES PAYABLE – DIRECT CORPORATE OBLIGATIONS - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Debt Instrument [Line Items] | ||
| Outstanding principal | $ 1,336.3 | $ 1,335.6 |
| Unamortized debt issue costs | $ (11.7) | (12.4) |
| 6.450% Senior Notes due June 2034 | Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Interest rate | 6.45% | |
| Outstanding principal | $ 700.0 | 700.0 |
| Unamortized discount on 6.450% Senior Notes due June 2034 | $ (2.0) | (2.0) |
| 5.125% Subordinated Debentures due 2060 | Subordinated Debt | ||
| Debt Instrument [Line Items] | ||
| Interest rate | 5.125% | |
| Outstanding principal | $ 150.0 | 150.0 |
| 5.250% Senior Notes due May 2029 | Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Interest rate | 5.25% | |
| Outstanding principal | $ 500.0 | $ 500.0 |
| X | ||||||||||
- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after accumulated amortization, of debt discount. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount, before accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|