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BUSINESS SEGMENT INFORMATION - Identifiable Assets by Segment (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]    
Assets $ 2,965.5 $ 3,031.8
Operating Segments | AWP    
Segment Reporting Information [Line Items]    
Assets 1,700.9 1,541.0
Operating Segments | MP    
Segment Reporting Information [Line Items]    
Assets 1,597.9 1,596.3
Corporate and Other / Eliminations    
Segment Reporting Information [Line Items]    
Assets (339.2) (111.8)
Discontinued Operations, Held-for-sale    
Segment Reporting Information [Line Items]    
Assets held for sale $ 5.9 $ 6.3