Goodwill and Other Intangible Assets, net - Net Carrying Value of Other Intangibles (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Net book value of other intangible assets by the reportable segment
Other intangible assets, net	$ 1,234.4	$ 872.2
Goodwill	1,601.8	1,081.2		$ 1,134.4
Carlisle Construction Materials
Net book value of other intangible assets by the reportable segment
Other intangible assets, net	325.1	55.2
Goodwill	544.3	117.5		118.7
Carlisle Interconnect Technologies
Net book value of other intangible assets by the reportable segment
Other intangible assets, net	344.5	379.1
Goodwill	640.3	639.1		555.4
Carlisle Fluid Technologies
Net book value of other intangible assets by the reportable segment
Other intangible assets, net	302.5	313.7
Goodwill	171.0	167.9		173.4
Carlisle Brake & Friction
Net book value of other intangible assets by the reportable segment
Other intangible assets, net	92.9	99.3
Goodwill	96.5	96.4	$ 96.5	226.6
Carlisle Food Service Products
Net book value of other intangible assets by the reportable segment
Other intangible assets, net	169.4	24.9
Goodwill	$ 149.7	$ 60.3		$ 60.3