Inventories (Summary Of Inventory Not Accounted For Under LIFO) (Details) - USD ($) $ in Millions |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Segment Reporting Information [Line Items] | ||
| FIFO inventory | $ 44.4 | $ 39.3 |
| U.S. Locations [Member] | ||
| Segment Reporting Information [Line Items] | ||
| FIFO inventory | 41.8 | 35.3 |
| Canada Locations [Member] | ||
| Segment Reporting Information [Line Items] | ||
| FIFO inventory | $ 2.6 | $ 4.0 |