BUSINESS SEGMENT INFORMATION - Identifiable Assets by Segment (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Assets	$ 3,068.5	$ 3,031.8
Operating Segments | AWP
Segment Reporting Information [Line Items]
Assets	1,834.5	1,541.0
Operating Segments | MP
Segment Reporting Information [Line Items]
Assets	1,668.5	1,596.3
Corporate and Other / Eliminations
Segment Reporting Information [Line Items]
Assets	(442.8)	(111.8)
Discontinued Operations, Held-for-sale
Segment Reporting Information [Line Items]
Assets held for sale	$ 8.3	$ 6.3