Revenue Recognition (Customer Accounts Receivable) (Details) - USD ($) $ in Millions |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Revenue Recognition [Abstract] | ||
| Customer Accounts Receivable, Billed (Less Reserve) | $ 525.1 | $ 479.4 |
| Customer Accounts Receivable, Unbilled (Less Reserve) | $ 408.1 | $ 337.6 |