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Acquisitions (Details) - USD ($)
$ in Millions
 3 Months Ended
Jan. 11, 2019
Mar. 31, 2019
Dec. 31, 2018
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Goodwill   $ 1,504.8 $ 1,441.8
Other Long-term Assets      
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Indemnification asset $ 5.2    
Petersen Aluminum Corporation      
Acquisitions      
Percentage of ownership interest acquired 100.00%    
Total cash consideration transferred $ 207.2    
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Cash and cash equivalents 5.2    
Receivables, net 11.5    
Inventories, net 39.5    
Prepaid expenses and other current assets 2.1    
Property, plant and equipment 17.8    
Definite-lived intangible assets 109.3    
Other long-term assets 9.5    
Accounts payable 5.9    
Income tax payable (1.7)    
Accrued liabilities and other (8.7)    
Other long-term liabilities (12.4)    
Deferred income taxes (25.4)    
Total identifiable net assets 144.2    
Goodwill 63.0    
Gross contractual accounts receivable acquired 11.6    
Receivables not expected to be collected 0.1    
Goodwill deductible for tax purposes 0.0    
Indemnification asset 5.2    
Petersen Aluminum Corporation | Acquired Technology      
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Finite-lived intangible assets acquired $ 3.1    
Useful life of finite lived intangible assets 14 years    
Petersen Aluminum Corporation | Customer relationships      
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Finite-lived intangible assets acquired $ 76.3    
Useful life of finite lived intangible assets 12 years    
Petersen Aluminum Corporation | Trade names      
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Finite-lived intangible assets acquired $ 29.9    
Useful life of finite lived intangible assets 10 years    
Carlisle Construction Materials      
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Goodwill   595.3 $ 532.8
Carlisle Construction Materials | Petersen Aluminum Corporation      
Acquisitions      
Contribution to net sales since acquisition   35.5  
Contribution to operating income since acquisition   $ (0.1)