Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) business	Sep. 30, 2020 USD ($)
Net Sales, EBIT, Assets continuing operations by reportable segment
Number of reportable segments | business			3
Revenues	$ 1,315.6	$ 1,057.0	$ 3,434.3	$ 2,981.6
Operating Income (Loss)	166.5	154.8	385.0	376.5
Operating segments
Net Sales, EBIT, Assets continuing operations by reportable segment
Revenues	1,315.6	1,057.0	3,434.3	2,981.6
Operating Income (Loss)	191.3	182.0	477.3	439.8
Corporate and unallocated
Net Sales, EBIT, Assets continuing operations by reportable segment
Revenues	0.0	0.0	0.0	0.0
Operating Income (Loss)	(24.8)	(27.2)	(92.3)	(63.3)
Carlisle Construction Materials | Operating segments
Net Sales, EBIT, Assets continuing operations by reportable segment
Revenues	1,065.8	823.5	2,722.4	2,234.8
Operating Income (Loss)	187.1	181.3	485.8	426.6
Carlisle Interconnect Technologies | Operating segments
Net Sales, EBIT, Assets continuing operations by reportable segment
Revenues	178.7	168.5	503.4	577.0
Operating Income (Loss)	(0.5)	(3.7)	(24.1)	11.2
Carlisle Fluid Technologies | Operating segments
Net Sales, EBIT, Assets continuing operations by reportable segment
Revenues	71.1	65.0	208.5	169.8
Operating Income (Loss)	$ 4.7	$ 4.4	$ 15.6	$ 2.0