GOODWILL AND INTANGIBLE ASSETS, NET (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Changes in goodwill by business segment
Balance at the beginning of the period, goodwill gross	$ 341.9
Accumulated impairment	(61.8)
Balance at the beginning of the period, goodwill net	280.1
Aquired goodwill recognized during the period	21.9
Foreign exchange effect and other	(28.9)
Balance at the end of the period, goodwill gross	334.9
Accumulated impairment	(61.8)
Balance at the end of the period, goodwill net	273.1
MP
Changes in goodwill by business segment
Balance at the beginning of the period, goodwill gross	202.2
Accumulated impairment	(23.2)
Balance at the beginning of the period, goodwill net	179.0
Aquired goodwill recognized during the period	21.9
Foreign exchange effect and other	(25.7)
Balance at the end of the period, goodwill gross	198.4
Accumulated impairment	(23.2)
Balance at the end of the period, goodwill net	175.2
MP | Steelweld
Changes in goodwill by business segment
Aquired goodwill recognized during the period	3.5
MP | ProAll International Mfg. Inc and ProAll UK Limited
Changes in goodwill by business segment
Aquired goodwill recognized during the period	18.4
AWP
Changes in goodwill by business segment
Balance at the beginning of the period, goodwill gross	139.7
Accumulated impairment	(38.6)
Balance at the beginning of the period, goodwill net	101.1
Aquired goodwill recognized during the period	0.0
Foreign exchange effect and other	(3.2)
Balance at the end of the period, goodwill gross	136.5
Accumulated impairment	(38.6)
Balance at the end of the period, goodwill net	$ 97.9