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BUSINESS SEGMENT INFORMATION - Identifiable Assets by Segment (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]    
Assets $ 3,654.8 $ 3,485.9
Operating Segments | AWP    
Segment Reporting Information [Line Items]    
Assets 2,150.2 1,983.5
Operating Segments | MP    
Segment Reporting Information [Line Items]    
Assets 1,222.0 1,160.1
Corporate and Other / Eliminations    
Segment Reporting Information [Line Items]    
Assets (130.8) (185.6)
Discontinued Operations, Held-for-sale    
Segment Reporting Information [Line Items]    
Assets held for sale $ 413.4 $ 527.9