Segment Information (Details.) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)
Net Sales, EBIT, Assets continuing operations by reportable segment
Number of reportable segments | segment			4
Revenues	$ 1,236.1	$ 983.9	$ 2,220.8	$ 1,757.9
Operating Income (Loss)	159.7	146.3	254.4	235.8
Corporate
Net Sales, EBIT, Assets continuing operations by reportable segment
Operating Income (Loss)	(19.9)	(11.7)	(38.4)	(30.5)
Carlisle Construction Materials
Net Sales, EBIT, Assets continuing operations by reportable segment
Revenues	828.6	631.2	1,427.2	1,077.3
Operating Income (Loss)	141.4	129.1	217.2	209.8
Carlisle Interconnect Technologies
Net Sales, EBIT, Assets continuing operations by reportable segment
Revenues	237.7	201.8	462.0	396.0
Operating Income (Loss)	27.5	20.2	54.7	41.7
Carlisle Fluid Technologies
Net Sales, EBIT, Assets continuing operations by reportable segment
Revenues	73.3	71.0	136.8	131.5
Operating Income (Loss)	7.8	7.4	13.5	12.3
Carlisle Brake & Friction
Net Sales, EBIT, Assets continuing operations by reportable segment
Revenues	96.5	79.9	194.8	153.1
Operating Income (Loss)	2.9	1.3	7.4	2.5
Segment total
Net Sales, EBIT, Assets continuing operations by reportable segment
Revenues	1,236.1	983.9	2,220.8	1,757.9
Operating Income (Loss)	$ 179.6	$ 158.0	$ 292.8	$ 266.3