Acquisitions (Details) £ in Millions, $ in Millions									1 Months Ended	2 Months Ended	3 Months Ended								6 Months Ended	9 Months Ended	11 Months Ended	12 Months Ended
	Nov. 20, 2019 USD ($)	Apr. 01, 2019 USD ($)	Jan. 11, 2019 USD ($)	Nov. 01, 2018 USD ($)	Nov. 01, 2017 USD ($)	Jul. 03, 2017 USD ($)	Jan. 31, 2017 GBP (£)	Jan. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Nov. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 31, 2017 USD ($)
Acquisitions
Total cash consideration transferred																						$ 42.4		$ 20.1
Aggregate cash purchase price, net of cash acquired																						616.4		19.5		$ 934.3
Goodwill acquired during the year																						274.5		5.5
Revenues											$ 1,144.3	$ 1,280.6	$ 1,314.8	$ 1,071.9	$ 1,077.3	$ 1,181.4	$ 1,236.1	$ 984.7				4,811.6		4,479.5		3,750.8
Operating Income (Loss)											141.3	$ 191.0	$ 207.2	$ 114.7	114.6	$ 140.0	$ 159.7	$ 94.7				$ 654.2		509.0		464.0
Useful life of finite lived intangible assets																						9 years 6 months
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill									$ 1,716.3	$ 1,452.1	1,716.3				1,441.8				$ 1,452.1	$ 1,716.3	$ 1,716.3	$ 1,716.3	$ 1,716.3	1,441.8		1,452.1
Other long-term assets
Acquisitions
Indemnification asset			$ 5.2
Customer relationships
Acquisitions
Useful life of finite lived intangible assets																						10 years
Providien
Acquisitions
Total cash consideration transferred	$ 332.1
Earnings (loss) before interest and taxes									0.1
Revenues									11.3
Business combination gross receivables	38.9
Receivables not expected to be collected	0.1
Goodwill deductible for tax purpose	42.9
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and cash equivalents	3.4
Receivables, net	38.9
Inventories	2.7
Prepaid expenses and other current assets	2.3
Property, plant and equipment	12.9
Definite-lived intangible assets	135.4
Other long-term assets	7.1
Accounts payable	(6.0)
Income tax payable	(0.7)
Accrued and other current liabilities	(7.0)
Other long-term liabilities	(8.1)
Deferred income taxes	(27.1)
Total identifiable net assets	153.8
Goodwill	178.3
Deferred tax liabilities	$ 27.1
Providien | Customer relationships
Acquisitions
Useful life of finite lived intangible assets	14 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets	$ 111.7
Providien | Acquired Technology
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets	$ 19.5
Providien | Acquired Technology | Minimum
Acquisitions
Useful life of finite lived intangible assets	6 years
Providien | Acquired Technology | Maximum
Acquisitions
Useful life of finite lived intangible assets	11 years
Providien | Trade names
Acquisitions
Useful life of finite lived intangible assets	2 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets	$ 4.1
Petersen Aluminum
Acquisitions
Total cash consideration transferred			$ 207.2																				207.2
Percentage of ownership interest acquired			100.00%
Revenues																							176.2
Operating Income (Loss)																							9.8
Business combination gross receivables			$ 11.6
Receivables not expected to be collected			0.1
Indemnification asset			5.2
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and cash equivalents			5.2						5.2		5.2									5.2	5.2	$ 5.2	5.2
Receivables, net			11.5						11.5		11.5									11.5	11.5	11.5	11.5
Inventories			39.5						39.2		39.2									39.2	39.2	39.2	39.2
Prepaid expenses and other current assets			2.1						2.1		2.1									2.1	2.1	2.1	2.1
Property, plant and equipment			17.8						17.8		17.8									17.8	17.8	17.8	17.8
Definite-lived intangible assets			109.3						110.1		110.1									110.1	110.1	110.1	110.1
Other long-term assets			9.5						9.5		9.5									9.5	9.5	9.5	9.5
Accounts payable			(5.9)						(5.9)		(5.9)									(5.9)	(5.9)	(5.9)	(5.9)
Income tax payable			1.7						1.7		1.7									1.7	1.7	1.7	1.7
Accrued and other current liabilities			(8.7)						(8.7)		(8.7)									(8.7)	(8.7)	(8.7)	(8.7)
Other long-term liabilities			(12.4)						(12.5)		(12.5)									(12.5)	(12.5)	(12.5)	(12.5)
Deferred income taxes			(25.4)						(25.6)		(25.6)									(25.6)	(25.6)	(25.6)	(25.6)
Total identifiable net assets			144.2						144.4		144.4									144.4	144.4	144.4	144.4
Goodwill			63.0						62.8		62.8									62.8	62.8	62.8	62.8
Deferred tax liabilities			$ 25.4						25.6		25.6									25.6	25.6	25.6	25.6
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			$ 79.7
Petersen Aluminum | Acquired Technology
Acquisitions
Useful life of finite lived intangible assets			10 years
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets			$ 2.5
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			$ 27.9
Petersen Aluminum | Adjustment
Recognized amounts of identifiable assets acquired and liabilities assumed:
Inventories									(0.3)		(0.3)									(0.3)	(0.3)	(0.3)	(0.3)
Definite-lived intangible assets									0.8		0.8									0.8	0.8	0.8	0.8
Other long-term liabilities									0.1		0.1									0.1	0.1	0.1	0.1
Deferred income taxes									0.2		0.2									0.2	0.2	0.2	0.2
Total identifiable net assets									0.2		0.2									0.2	0.2	0.2	0.2
Goodwill									(0.2)		(0.2)									(0.2)	(0.2)	(0.2)	(0.2)
Deferred tax liabilities									$ (0.2)		$ (0.2)									$ (0.2)	$ (0.2)	$ (0.2)	$ (0.2)
MicroConnex
Acquisitions
Total cash consideration transferred		$ 46.2
Percentage of ownership interest acquired									100.00%		100.00%									100.00%	100.00%	100.00%	100.00%
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and cash equivalents		0.8
Accella
Acquisitions
Total consideration transferred				$ 671.4
Percentage of ownership interest acquired					100.00%
Net sales										64.0
Earnings (loss) before interest and taxes										(9.0)
Business combination gross receivables					$ 68.5
Receivables not expected to be collected					1.7
Goodwill deductible for tax purpose					19.7
Indemnification asset					25.0
Business Acquisition, Pro Forma Information [Abstract]
Net sales																								4,439.4
Income from continuing operations																								351.8
Depreciation and amortization related to preliminary fair value adjustments																								10.8
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and cash equivalents				16.5																					$ 16.5
Receivables, net				66.8																					66.8
Inventories				47.5																					47.5
Prepaid expenses and other current assets				0.9																					0.9
Property, plant and equipment				62.8																					62.8
Definite-lived intangible assets				239.0	239.0																				239.0
Other long-term assets				15.6	15.6																				15.6
Accounts payable				(45.5)																					(45.5)
Income tax payable				2.0																					2.0
Accrued and other current liabilities				(13.7)																					(13.7)
Other long-term liabilities				(15.6)																					(15.6)
Deferred income taxes				(81.5)																					(81.5)
Total identifiable net assets				294.8																					294.8
Goodwill				376.6																					376.6
Deferred tax liabilities				81.5																					81.5
Net change in indemnification asset																						$ 1.9		4.6
Accella | Customer relationships
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets					$ 145.0
Accella | Customer relationships | Minimum
Acquisitions
Useful life of finite lived intangible assets					9 years
Accella | Customer relationships | Maximum
Acquisitions
Useful life of finite lived intangible assets					11 years
Accella | Technology
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets					$ 66.0
Accella | Technology | Minimum
Acquisitions
Useful life of finite lived intangible assets					3 years
Accella | Technology | Maximum
Acquisitions
Useful life of finite lived intangible assets					14 years
Accella | Trade names
Recognized amounts of identifiable assets acquired and liabilities assumed:
Definite-lived intangible assets					$ 28.0
Accella | Trade names | Minimum
Acquisitions
Useful life of finite lived intangible assets					4 years
Accella | Trade names | Maximum
Acquisitions
Useful life of finite lived intangible assets					14 years
Accella | Adjustment
Acquisitions
Total cash consideration transferred																									0.7
Recognized amounts of identifiable assets acquired and liabilities assumed:
Inventories				(1.0)																					(1.0)
Property, plant and equipment				3.2																					3.2
Definite-lived intangible assets				(1.0)																					(1.0)
Accrued and other current liabilities				9.5																					9.5
Deferred income taxes				2.0																					2.0
Total identifiable net assets				12.7																					12.7
Goodwill				(12.0)																					(12.0)
Deferred tax liabilities				$ (2.0)																					$ (2.0)
Drexel Metals
Acquisitions
Percentage of ownership interest acquired						100.00%
Aggregate cash purchase price, net of cash acquired						$ 55.8
Net sales																			26.8
Earnings (loss) before interest and taxes																			(0.2)
Goodwill acquired during the year						26.9
Recognized amounts of identifiable assets acquired and liabilities assumed:
Receivables, net					$ 5.3
Inventories					8.8
Accounts payable					(5.8)
Deferred income taxes					(10.8)
Finite-lived Intangible Assets Acquired						19.0
Indefinite-lived Intangible Assets Acquired						$ 10.4
Deferred tax liabilities					10.8
Drexel Metals | Customer relationships
Acquisitions
Useful life of finite lived intangible assets						9 years
Arbo
Acquisitions
Percentage of ownership interest acquired							100.00%																				100.00%
Aggregate cash purchase price, net of cash acquired							£ 9.1	$ 11.5
Goodwill acquired during the year								4.7
Revenues																					$ 14.0
Operating Income (Loss)																					0.3
Contingent consideration							£ 2.0																				$ 2.5
Goodwill deductible for tax purpose																											1.3
Recognized amounts of identifiable assets acquired and liabilities assumed:
Receivables, net																											1.5
Inventories																											2.1
Accounts payable																											(1.4)
Deferred income taxes																											(1.4)
Finite-lived Intangible Assets Acquired								2.2
Indefinite-lived Intangible Assets Acquired								$ 1.6
Deferred tax liabilities																											$ 1.4
Arbo | Customer relationships
Acquisitions
Useful life of finite lived intangible assets							15 years	15 years
Carlisle Construction Materials
Acquisitions
Goodwill acquired during the year																						64.3		2.8
Revenues																						3,233.3		2,880.3		2,336.2
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill									$ 597.1	544.3	$ 597.1				532.8				544.3	$ 597.1	597.1	597.1	$ 597.1	532.8		544.3
Carlisle Construction Materials | Acquisition-related costs | Accella
Acquisitions
Earnings (loss) before interest and taxes										1.1
Carlisle Construction Materials | Fair value adjustment to inventory | Accella
Acquisitions
Earnings (loss) before interest and taxes										5.5
Carlisle Interconnect Technologies
Acquisitions
Goodwill acquired during the year																						194.1		2.7
Revenues																						972.9		933.8		815.3
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill									$ 835.2	$ 640.3	$ 835.2				$ 643.1				$ 640.3	835.2	$ 835.2	$ 835.2	$ 835.2	$ 643.1		$ 640.3
Carlisle Interconnect Technologies | MicroConnex
Acquisitions
Revenues																				10.2
Operating Income (Loss)																				$ (0.8)
Goodwill deductible for tax purpose		0.0
Recognized amounts of identifiable assets acquired and liabilities assumed:
Receivables, net		3.4
Inventories		0.9
Definite-lived intangible assets		27.4
Accounts payable		(0.6)
Deferred income taxes		(7.0)
Goodwill		15.2
Deferred tax liabilities		$ 7.0
Carlisle Interconnect Technologies | MicroConnex | Customer relationships
Acquisitions
Useful life of finite lived intangible assets		12 years
Carlisle Interconnect Technologies | MicroConnex | Acquired 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
Preliminary Allocation | Accella
Acquisitions
Total cash consideration transferred					670.7
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and cash equivalents					16.5
Receivables, net					66.8
Inventories					48.5
Prepaid expenses and other current assets					0.9
Property, plant and equipment					59.6
Definite-lived intangible assets					240.0
Other long-term assets					15.6
Accounts payable					(45.5)
Income tax payable					2.0
Accrued and other current liabilities					(23.2)
Other long-term liabilities					(15.6)
Deferred income taxes					(83.5)
Total identifiable net assets					282.1
Goodwill					388.6
Deferred tax liabilities					$ 83.5