|**Inventories**                     | 3 Months Ended                                                                                                                                                                                                                                                                                  
|----------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
|**Inventory Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                 
|Inventories                         | InventoriesThe following table presents the components of the Company’s inventory balances:(dollars in millions)March 31,2022December 31, 2021Finished products$199.2$190.2Work in process51.442.0Raw materials315.3286.3Inventories, at FIFO cost565.9518.5LIFO reserve(77.2)(70.8)$488.7$447.7
|                                    |                                                                                                                                                                                                                                                                                                 
|(dollars in millions)               | March 31,2022                                                                                                                                                                                                                                                                                   
|Finished products                   | $                                                                                                                                                                                                                                                                                               
|Work in process                     | 51.4                                                                                                                                                                                                                                                                                            
|Raw materials                       | 315.3                                                                                                                                                                                                                                                                                           
|Inventories, at FIFO cost           | 565.9                                                                                                                                                                                                                                                                                           
|LIFO reserve                        | (77.2)                                                                                                                                                                                                                                                                                          
|                                    | $                                                                                                                                                                                                                                                                                               

X- ReferencesNo definition available.
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+ ReferencesReference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998
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