BUSINESS SEGMENT INFORMATION - Net Sales and Income (Loss) from Operations by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net sales	$ 1,024.6	$ 1,098.8	$ 3,468.1	$ 3,468.4
Income (loss) from operations	86.4	104.2	312.1	330.9
Operating Segments | AWP
Segment Reporting Information [Line Items]
Net sales	628.2	729.4	2,226.5	2,319.2
Income (loss) from operations	45.9	81.6	191.8	263.4
Operating Segments | MP
Segment Reporting Information [Line Items]
Net sales	338.6	313.6	1,050.0	964.7
Income (loss) from operations	52.4	41.4	157.9	125.6
Corporate and Other / Eliminations
Segment Reporting Information [Line Items]
Net sales	57.8	55.8	191.6	184.5
Income (loss) from operations	$ (11.9)	$ (18.8)	$ (37.6)	$ (58.1)