Revenue Recognition (Customer Accounts Receivable) (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Revenue from Contract with Customer [Abstract] | ||
| Customer Accounts Receivable, Billed (Less Reserve) | $ 519.6 | $ 525.1 |
| Customer Accounts Receivable, Unbilled (Less Reserve) | $ 235.8 | $ 408.1 |