Discontinued Operations - Results from Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Provision for (benefit from) income taxes	$ 1.1	$ (0.5)	$ 2.5	$ (1.6)
Income (loss) from discontinued operations	5.2	(0.6)	8.3	(3.6)
Carlisle Brake & Friction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	98.8	58.8	186.9	129.8
Cost of goods sold	76.1	47.8	147.4	109.8
Other operating expenses, net	11.8	12.1	23.8	25.6
Operating income (loss)	10.9	(1.1)	15.7	(5.6)
Other non-operating (income) expense, net	(0.1)	0.0	0.2	(0.4)
Income (loss) from discontinued operations before income taxes	11.0	(1.1)	15.5	(5.2)
Pre-close transaction expenses	(4.7)	0.0	(4.7)	0.0
Provision for (benefit from) income taxes	1.1	(0.5)	2.5	(1.6)
Income (loss) from discontinued operations	$ 5.2	$ (0.6)	$ 8.3	$ (3.6)