| **Inventories (Tables)**            | 12 Months Ended                                                                                                                                                                                                                                                                                                                               |
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| **Inventory Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                          |
| Schedule of Inventories             | The following table presents the components of the Company’s inventory balances:December 31 (dollars in millions)20212020Finished products$190.2 $143.4 Work in process42.0 21.8 Raw materials286.3 159.2 Inventories, at FIFO cost518.5 324.4 LIFO reserve(70.8)(24.3)$447.7 $300.1  |

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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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