BUSINESS SEGMENT INFORMATION - Net Sales and Income (Loss) from Operations by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 993.8	$ 765.6	$ 2,896.7	$ 2,289.7
Income (loss) from operations	74.2	36.5	258.2	36.8
Operating Segments | AWP
Segment Reporting Information [Line Items]
Net sales	572.5	445.0	1,644.4	1,370.6
Income (loss) from operations	34.9	13.3	126.7	2.4
Operating Segments | MP
Segment Reporting Information [Line Items]
Net sales	418.7	311.3	1,237.7	890.5
Income (loss) from operations	57.1	40.3	178.3	88.7
Corporate and Other / Eliminations
Segment Reporting Information [Line Items]
Net sales	2.6	9.3	14.6	28.6
Income (loss) from operations	$ (17.8)	$ (17.1)	$ (46.8)	$ (54.3)