| **Inventories (Tables)**            | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                   |
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| **Inventory Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                             |
| Schedule of Inventories             | The following table presents the components of the Company’s inventory balances:(dollars in millions)March 31,2024December 31, 2023Finished products$196.8 $177.7 Work in process44.2 44.2 Raw materials325.6 322.6 Inventories, at FIFO cost566.6 544.5 LIFO reserve(44.3)(47.1)Inventories, at LIFO cost$522.3 $497.4  |

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| - References
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| - Definition
Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.
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