Acquisitions (Details) - USD ($)						1 Months Ended	5 Months Ended	9 Months Ended	12 Months Ended
	Jul. 22, 2020	Jan. 11, 2020	Nov. 20, 2019	Apr. 01, 2019	Jan. 11, 2019	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Nov. 20, 2020	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Nov. 30, 2017
Acquisitions
Cash consideration									$ 3,200,000		$ 42,400,000
Revenues									4,245,200,000		4,811,600,000		$ 4,479,500,000
Operating Income (Loss)									$ 483,600,000		654,200,000		509,000,000.0
Useful life of finite lived intangible assets									8 years 8 months 12 days
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill						$ 1,716,300,000	$ 1,738,200,000	$ 1,716,300,000	$ 1,738,200,000		1,716,300,000	$ 1,716,300,000	1,441,800,000
Net change in indemnification asset									$ 4,700,000		1,900,000		4,600,000
Other long-term assets
Acquisitions
Indemnification asset					$ 5,200,000
Customer relationships
Acquisitions
Useful life of finite lived intangible assets									9 years 1 month 6 days
Motion Tech Automation, LLC
Acquisitions
Cash consideration	$ 33,300,000
Percentage of ownership interest acquired	100.00%
Revenues							9,900,000
Operating Income (Loss)							(500,000)
Goodwill deductible for tax purpose	$ 16,600,000
Maximum indemnification	1,600,000
Indemnification asset	1,500,000
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and cash equivalents	300,000
Receivables, net	2,800,000
Inventories	4,300,000
Definite-lived intangible assets	4,300,000
Accounts payable	(1,300,000)
Goodwill	$ 16,600,000
Motion Tech Automation, LLC | Customer relationships
Acquisitions
Useful life of finite lived intangible assets	9 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets	$ 1,000,000.0
Motion Tech Automation, LLC | Technology
Acquisitions
Useful life of finite lived intangible assets	9 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets	$ 2,300,000
Motion Tech Automation, LLC | Trade names
Acquisitions
Useful life of finite lived intangible assets	5 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets	$ 1,000,000.0
Providien
Acquisitions
Cash consideration			$ 332,100,000							$ 331,300,000
Earnings (loss) before interest and taxes						100,000
Revenues						11,300,000
Receivables not expected to be collected							100,000		$ 100,000
Goodwill deductible for tax purpose			67,500,000
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and cash equivalents			3,400,000							3,400,000
Receivables, net			9,800,000							9,800,000
Inventories			2,700,000							2,400,000
Contract assets			29,100,000							24,600,000
Prepaid expenses and other current assets			2,300,000							1,400,000
Property, plant and equipment			12,900,000							12,900,000
Definite-lived intangible assets			135,400,000							132,700,000
Other long-term assets			7,100,000							6,800,000
Accounts payable			(6,000,000.0)							(5,800,000)
Income tax payable			(700,000)							100,000
Accrued and other current liabilities			(7,000,000.0)							(7,000,000.0)
Other long-term liabilities			(8,100,000)							(7,000,000.0)
Deferred income taxes			(27,100,000)							(19,000,000.0)
Total identifiable net assets			153,800,000							155,300,000
Goodwill			178,300,000							176,000,000.0
Acquired definite-lived intangible assets, excluding developed software										132,600,000
Deferred tax liabilities			$ 27,100,000							19,000,000.0
Providien | Customer relationships
Acquisitions
Useful life of finite lived intangible assets			14 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Acquired definite-lived intangible assets, excluding developed software										108,700,000
Providien | Technology
Acquisitions
Useful life of finite lived intangible assets			7 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Acquired definite-lived intangible assets, excluding developed software										19,500,000
Providien | Trade names
Acquisitions
Useful life of finite lived intangible assets			2 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Acquired definite-lived intangible assets, excluding developed software										4,400,000
Providien | Adjustment
Acquisitions
Cash consideration										(800,000)
Recognized amounts of identifiable assets acquired and liabilities assumed:
Inventories										(300,000)
Contract assets										(4,500,000)
Prepaid expenses and other current assets										(900,000)
Definite-lived intangible assets										(2,700,000)
Other long-term assets										(300,000)
Accounts payable										200,000
Income tax payable										800,000
Other long-term liabilities										1,100,000
Deferred income taxes										8,100,000
Total identifiable net assets										1,500,000
Goodwill										(2,300,000)
Deferred tax liabilities										$ (8,100,000)
Petersen Aluminum
Acquisitions
Cash consideration		$ 207,200,000			$ 207,200,000
Percentage of ownership interest acquired					100.00%
Revenues												176,200,000
Operating Income (Loss)												9,800,000
Business combination gross receivables					$ 11,600,000
Receivables not expected to be collected					100,000
Goodwill deductible for tax purpose		0
Indemnification asset					5,200,000
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and cash equivalents		5,200,000			5,200,000
Receivables, net		11,500,000			11,500,000
Inventories		39,200,000			39,500,000
Prepaid expenses and other current assets		2,100,000			2,100,000
Property, plant and equipment		17,800,000			17,800,000
Definite-lived intangible assets		110,100,000			109,300,000
Other long-term assets		9,500,000			9,500,000
Accounts payable		(5,900,000)			(5,900,000)
Income tax payable		1,700,000			1,700,000
Accrued and other current liabilities		(8,700,000)			(8,700,000)
Other long-term liabilities		(12,500,000)			(12,400,000)
Deferred income taxes		(25,600,000)			(25,400,000)
Total identifiable net assets		144,400,000			144,200,000
Goodwill		62,800,000			63,000,000.0
Deferred tax liabilities		25,600,000			$ 25,400,000
Net change in indemnification asset									3,000,000.0
Petersen Aluminum | Customer relationships
Acquisitions
Useful life of finite lived intangible assets					11 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets					$ 79,700,000
Petersen Aluminum | Technology
Acquisitions
Useful life of finite lived intangible assets					10 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets					$ 2,500,000
Petersen Aluminum | Trade names
Acquisitions
Useful life of finite lived intangible assets					17 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets					$ 27,900,000
Petersen Aluminum | Adjustment
Recognized amounts of identifiable assets acquired and liabilities assumed:
Inventories		(300,000)
Definite-lived intangible assets		800,000
Other long-term liabilities		(100,000)
Deferred income taxes		(200,000)
Total identifiable net assets		200,000
Goodwill		(200,000)
Deferred tax liabilities		$ 200,000
MicroConnex
Acquisitions
Cash consideration				$ 46,200,000
Percentage of ownership interest acquired				100.00%
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and cash equivalents				$ 800,000
Accella Holdings LLC
Acquisitions
Indemnification asset														$ 15,600,000
Carlisle Construction Materials
Acquisitions
Revenues									2,995,600,000		3,233,300,000		2,880,300,000
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill						597,100,000	613,000,000.0	597,100,000	613,000,000.0		597,100,000	597,100,000	532,800,000
Carlisle Construction Materials | Motion Tech Automation, LLC
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill	11,000,000.0
Carlisle Fluid Technologies
Acquisitions
Revenues									242,700,000		278,400,000		291,600,000
Carlisle Fluid Technologies | Motion Tech Automation, LLC
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill	2,800,000
Carlisle Interconnect Technologies
Acquisitions
Revenues									731,600,000		972,900,000		933,800,000
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill						$ 835,200,000	$ 835,600,000	835,200,000	$ 835,600,000		$ 835,200,000	$ 835,200,000	$ 643,100,000
Carlisle Interconnect Technologies | Motion Tech Automation, LLC
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill	$ 2,800,000
Carlisle Interconnect Technologies | MicroConnex
Acquisitions
Revenues								10,200,000
Operating Income (Loss)								$ (800,000)
Goodwill deductible for tax purpose				0
Recognized amounts of identifiable assets acquired and liabilities assumed:
Receivables, net				3,400,000
Inventories				900,000
Definite-lived intangible assets				27,400,000
Accounts payable				(600,000)
Deferred income taxes				(7,000,000.0)
Goodwill				15,200,000
Deferred tax liabilities				$ 7,000,000.0
Carlisle Interconnect Technologies | MicroConnex | Customer relationships
Acquisitions
Useful life of finite lived intangible assets				12 years
Carlisle Interconnect Technologies | MicroConnex | Technology
Acquisitions
Useful life of finite lived intangible assets				5 years
Carlisle Interconnect Technologies | MicroConnex | Trade names
Acquisitions
Useful life of finite lived intangible assets				17 years