Exit and Disposal Activities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Exit and disposal costs accrued
Balance at the beginning of period	$ 1.2	$ 1.2
Charges		13.7	$ 17.9	$ 26.8
Cash payments		(9.7)
Balance at the end of period		5.2	1.2
Carlisle Interconnect Technologies
Exit and disposal costs accrued
Charges		8.5	3.2	9.5
Carlisle Fluid Technologies
Exit and disposal costs accrued
Charges	$ 2.7		1.1	11.4
Carlisle Brake & Friction
Exit and disposal activities
Exit and disposal costs, expected to be incurred		20.8
Exit and disposal costs accrued
Charges		2.2	13.6	5.1
Carlisle Construction Materials
Exit and disposal costs accrued
Charges			0.0	0.0
Cost of goods sold
Exit and disposal costs accrued
Charges		7.1	15.5	10.9
Selling and administrative expenses
Exit and disposal costs accrued
Charges		5.6	1.9	15.8
Research and development expenses
Exit and disposal costs accrued
Charges		0.1	0.1	0.1
Other operating (income) expense, net
Exit and disposal costs accrued
Charges		0.9	0.4	0.0
Corporate
Exit and disposal costs accrued
Charges		0.0	0.0	0.8
Employee severance and benefit arrangements
Exit and disposal costs accrued
Charges		7.5	3.2	17.8
Employee severance and benefit arrangements | Carlisle Interconnect Technologies
Exit and disposal activities
Exit and disposal costs, expected to be incurred		9.1
Exit and disposal costs, expected cost remaining		0.5
Exit and disposal costs accrued
Charges		8.0
Accelerated depreciation
Exit and disposal costs accrued
Charges		0.2	2.3	3.7
Lease termination costs
Exit and disposal costs accrued
Charges		1.8	1.1	0.0
Relocation costs
Exit and disposal costs accrued
Charges		0.9	6.3	1.9
Other restructuring costs
Exit and disposal costs accrued
Charges		3.3	$ 5.0	$ 3.4
Manufacturing Operations | Carlisle Brake & Friction
Exit and disposal costs accrued
Charges		2.2
Manufacturing Operations | Carlisle Construction Materials
Exit and disposal costs accrued
Charges		$ 0.3