DISCONTINUED OPERATIONS AND ASSETS AND LIABILITIES HELD FOR SALE - Supplemental Cash Flow Information Related to Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 470.6		$ 470.6		$ 339.5
Total cash and cash equivalents	475.5	$ 329.5	475.5	$ 329.5	372.1	$ 630.1
Impairments			82.2	3.5
Demag-Mobile Cranes Business | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents - held for sale	4.9		4.9		$ 32.6
Depreciation and amortization	0.1	3.3	3.3	11.1
Impairments	0.0	0.0	82.1	0.9
Deferred taxes	(7.3)	(4.1)	(5.2)	(3.9)
Capital expenditures	$ (0.7)	$ (2.9)	$ (3.4)	$ (10.3)