Segment Information (Details.) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Sales, EBIT, Assets continuing operations by reportable segment
Net sales	$ 1,089.1	$ 991.0	$ 3,018.1	$ 2,781.9
EBIT	142.9	36.4	398.4	325.9
Impairment charges	0.0	141.5	0.0	141.5
Corporate
Net Sales, EBIT, Assets continuing operations by reportable segment
EBIT	(19.9)	(15.0)	(49.4)	(45.1)
Carlisle Construction Materials
Net Sales, EBIT, Assets continuing operations by reportable segment
Net sales	640.2	578.2	1,717.5	1,564.4
EBIT	124.2	132.0	333.9	337.4
Carlisle Interconnect Technologies
Net Sales, EBIT, Assets continuing operations by reportable segment
Net sales	210.8	218.2	606.8	624.3
EBIT	25.7	42.2	68.1	118.4
Carlisle Food Service Products
Net Sales, EBIT, Assets continuing operations by reportable segment
Net sales	86.7	63.0	257.8	186.9
EBIT	11.6	9.0	29.5	24.3
Carlisle Fluid Technologies
Net Sales, EBIT, Assets continuing operations by reportable segment
Net sales	70.9	69.0	202.4	198.4
EBIT	0.1	9.5	12.5	23.7
Carlisle Brake & Friction
Net Sales, EBIT, Assets continuing operations by reportable segment
Net sales	80.5	62.6	233.6	207.9
EBIT	$ 1.2	$ (141.3)	$ 3.8	(132.8)
Impairment charges				$ 141.5