Benefit Plans and Other Postretirement Benefits, Defined contribution plans (Details) - UNITED STATES - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Defined contribution plans | ||
| Contributions to U.S. defined contribution plans by the Company, maximum percentage of eligible compensation | 7.00% | 7.00% |
| Matching contributions to U.S. defined contribution plans by the Company | $ 25.5 | $ 18.9 |