Property and Equipment, Net (Q2) (Details) - USD ($) $ in Thousands |
Jun. 30, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Property, Plant and Equipment [Line Items] | |||
| Total property and equipment | $ 18,585,117 | $ 12,880,005 | $ 3,600,786 |
| Less: accumulated depreciation and amortization | (1,953,607) | (965,231) | (116,796) |
| Total property and equipment, net | 16,631,510 | 11,914,774 | 3,483,990 |
| Technology equipment | |||
| Property, Plant and Equipment [Line Items] | |||
| Total property and equipment | 13,170,295 | 9,146,575 | 1,298,127 |
| Software | |||
| Property, Plant and Equipment [Line Items] | |||
| Total property and equipment | 459,742 | 139,508 | 14,937 |
| Data center equipment and leasehold improvements | |||
| Property, Plant and Equipment [Line Items] | |||
| Total property and equipment | 830,875 | 384,372 | 29,332 |
| Furniture, fixtures, and other assets | |||
| Property, Plant and Equipment [Line Items] | |||
| Total property and equipment | 12,949 | 8,684 | 1,717 |
| Construction in progress | |||
| Property, Plant and Equipment [Line Items] | |||
| Total property and equipment | $ 4,111,256 | $ 3,200,866 | $ 2,256,673 |