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Long-Term Debt - Contingent Funding Agreements (Details) $ in Millions | May 15, 2025 USD ($) | Mar. 06, 2025 USD ($) | Mar. 08, 2018 USD ($) item | Sep. 30, 2025 USD ($) | Mar. 19, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | --- | --- | --- | --- | ---
Long-Term Debt |  |  |  |  |  |
Outstanding principal balances |  |  |  | $ 3,958.6 |  | $ 3,980.4
Senior Notes due 2028 | Senior notes |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 4.111% |
Long-term debt issued |  |  |  |  | $ 400.0 |
4.111% notes payable, due 2028 |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.111% |  |
Outstanding principal balances |  |  |  | $ 400.0 |  |
3.4% notes payable, due 2025 |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Interest rate (as a percent) | 3.40% |  |  |  |  | 3.40%
Outstanding principal balances |  |  |  |  |  | $ 400.0
Repayment of senior notes at or prior to maturity | $ 400.0 |  |  |  |  |
2028 Trust |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Pre-capitalized trust securities sold |  |  | $ 400.0 |  |  |
Contingent funding agreements |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Number of contingent funding agreements | item |  |  | 2 |  |  |
10-year contingent funding agreement | 2028 Trust |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Term of contingent funding agreement |  |  | 10 years |  |  |
Semi-annual put premium (as a percent) |  |  | 1.275% |  |  |
10-year contingent funding agreement | 2028 Trust | Senior Notes due 2028 |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Amount of notes issuable under option |  |  | $ 400.0 |  |  |
Interest rate (as a percent) |  |  | 4.111% |  | 4.111% |
30-year contingent funding agreement | 2048 Trust |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Term of contingent funding agreement |  |  | 30 years |  |  |
Annual put premium (as a percent) |  |  | 1.58% |  |  |
30-year contingent funding agreement | 2048 Trust | Senior Notes due 2048 |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Amount of notes issuable under option |  |  | $ 350.0 |  |  |
Interest rate (as a percent) |  |  | 4.682% |  |  |
30-year contingent funding agreement | 2055 Trust |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Term of contingent funding agreement |  | 30 years |  |  |  |
Semi-annual put premium (as a percent) |  | 1.289% |  |  |  |
30-year contingent funding agreement | 2055 Trust | Senior Notes Due 2055 |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Amount of notes issuable under option |  | $ 500.0 |  |  |  |
Interest rate (as a percent) |  | 5.807% |  |  |  |
2048 Trust |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Pre-capitalized trust securities sold |  |  | $ 350.0 |  |  |
2055 Trust |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Pre-capitalized trust securities sold |  | $ 500.0 |  |  |  |

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