BUSINESS SEGMENT INFORMATION - Net Sales and Income (Loss) from Operations by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 690.5	$ 1,306.9	$ 1,524.1	$ 2,443.5
Income (loss) from operations	7.4	126.0	0.3	225.7
Operating Segments | AWP
Segment Reporting Information [Line Items]
Net sales	413.9	870.4	925.6	1,598.3
Income (loss) from operations	(5.0)	86.3	(10.9)	145.9
Operating Segments | MP
Segment Reporting Information [Line Items]
Net sales	263.6	430.9	579.2	841.4
Income (loss) from operations	23.4	65.3	48.4	124.8
Corporate and Other / Eliminations
Segment Reporting Information [Line Items]
Net sales	13.0	5.6	19.3	3.8
Income (loss) from operations	$ (11.0)	$ (25.6)	$ (37.2)	$ (45.0)