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New Accounting Pronouncements (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2020
USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance as of January 1, 2020 $ 6.6
Current period provision 1.6
Amounts written off (0.7)
Balance as of September 30, 2020 7.5
Corporate  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance as of January 1, 2020 0.5
Current period provision 0.0
Amounts written off 0.0
Balance as of September 30, 2020 0.5
Carlisle Construction Materials  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance as of January 1, 2020 2.2
Current period provision 0.9
Amounts written off (0.4)
Balance as of September 30, 2020 2.7
Carlisle Interconnect Technologies  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance as of January 1, 2020 1.6
Current period provision 0.1
Amounts written off (0.3)
Balance as of September 30, 2020 1.4
Carlisle Fluid Technologies  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance as of January 1, 2020 1.1
Current period provision 0.1
Amounts written off 0.0
Balance as of September 30, 2020 1.2
Carlisle Brake & Friction  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance as of January 1, 2020 1.2
Current period provision 0.5
Amounts written off 0.0
Balance as of September 30, 2020 $ 1.7