|**Derivative Instruments (Tables)**                                                   | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
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|**Derivative Instruments and Hedging Activities Disclosure [Abstract]**               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Schedule of Contractual Amounts for Derivative Contracts                              | The following table summarizes, by currency, the contractual amounts of the Company’s foreign currency forward contracts that are designated as cash flow hedges:December 31 (dollars in millions)20212020BuySellBuySellBritish pound$—$—$—$1.0Canadian dollar—113.4—79.7Euro24.2—32.7—Mexican peso23.8—16.5—Total$48.0$113.4$49.2$80.7The following table summarizes the contractual amounts of the Company's foreign exchange contracts that are designated as balance sheet hedges:(dollars in millions)December 31, 2021BuySellCanadian dollar$—$125.6                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|December 31 (dollars in millions)                                                     | 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|                                                                                      | Buy                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|British pound                                                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Canadian dollar                                                                       | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Euro                                                                                  | 24.2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Mexican peso                                                                          | 23.8                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Total                                                                                 | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
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|(dollars in millions)                                                                 | December 31, 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                                      | Buy                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Canadian dollar                                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
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|Schedule of Impact of Derivatives on Company's Financial Statements                   | The following tables present the impact of derivative contracts on the Company’s financial statements.Fair value of derivatives designated as hedging instruments under ASC 815:Fair ValueDecember 31 (dollars in millions)Balance Sheet Location20212020Foreign currency contractsOther current assets$1.7$2.7Accrued liabilities(1.6)(7.0)Total derivatives designated as hedging instruments$0.1$(4.3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|December 31 (dollars in millions)                                                     | Balance Sheet Location                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Foreign currency contracts                                                            | Other current assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|                                                                                      | Accrued liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Total derivatives designated as hedging instruments                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Schedule of effect of derivatives on the condensed consolidated statement of earnings | The effect of cash flow hedges on the condensed consolidated statement of earnings:Years ended December 31 (dollars in millions)Derivatives in ASC 815 cash flow hedging relationshipsAmount of  (loss) gain recognized in other comprehensive loss on derivativesLocation of (loss) gain reclassified from accumulated other comprehensive loss into earningsAmount of  (loss) gain reclassified from accumulated other comprehensive loss into earnings2021202020212020Foreign currency contracts$(0.8)$2.3Cost of products sold$(0.8)$1.9Commodities contracts——Cost of products sold—(0.2)$(0.8)$2.3$(0.8)$1.7The amounts recognized within the consolidated statements of earnings related to the Company's foreign exchange contracts are set forth below.Years ended December 31 (dollars in millions)Derivatives not designated as hedging instruments:Location of gain within the consolidated statements of earnings202120202019Foreign exchange contractsOther income - net$0.9$—$—
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|Derivatives in ASC 815 cash flow hedging relationships                                | Amount of  (loss) gain recognized in other comprehensive loss on derivatives                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|                                                                                      | 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Foreign currency contracts                                                            | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Commodities contracts                                                                 | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                                      | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
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|Derivatives not designated as hedging instruments:                                    | Location of gain within the consolidated statements of earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Foreign exchange contracts                                                            | Other income - net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            

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