Long-lived Assets (Property and Equipment, Net) (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment, gross | $ 10,910.5 | $ 9,063.8 |
| Accumulated depreciation | (5,818.9) | (4,737.8) |
| Total property and equipment, net | 5,091.6 | 4,326.0 |
| Distribution systems | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment, gross | 6,913.4 | 5,702.7 |
| Support equipment, buildings and land | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment, gross | 2,972.3 | 2,518.0 |
| CPE | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment, gross | $ 1,024.8 | $ 843.1 |