Investments in Joint Ventures - Schedule of results of operations of the joint ventures (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Operating Revenue and Expenses | ||||
| Revenues | $ 263.7 | $ 293.9 | $ 543.6 | $ 584.4 |
| Expenses | 170.1 | 174.8 | 358.0 | 354.4 |
| Excess of revenues over expenses | $ 93.6 | $ 119.1 | $ 185.6 | $ 230.0 |