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GOODWILL AND INTANGIBLE ASSETS (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2023
USD ($)
Changes in goodwill by business segment  
Balance at the beginning of the period, goodwill gross $ 346.2
Accumulated impairment (61.8)
Balance at the beginning of the period, goodwill net 284.4
Acquisitions 0.3
Foreign exchange effect and other 0.1
Balance at the end of the period, goodwill gross 346.6
Accumulated impairment (61.8)
Balance at the end of the period, goodwill net 284.8
MP  
Changes in goodwill by business segment  
Balance at the beginning of the period, goodwill gross 208.2
Accumulated impairment (23.2)
Balance at the beginning of the period, goodwill net 185.0
Acquisitions 0.3
Foreign exchange effect and other 0.3
Balance at the end of the period, goodwill gross 208.8
Accumulated impairment (23.2)
Balance at the end of the period, goodwill net 185.6
AWP  
Changes in goodwill by business segment  
Balance at the beginning of the period, goodwill gross 138.0
Accumulated impairment (38.6)
Balance at the beginning of the period, goodwill net 99.4
Acquisitions 0.0
Foreign exchange effect and other (0.2)
Balance at the end of the period, goodwill gross 137.8
Accumulated impairment (38.6)
Balance at the end of the period, goodwill net 99.2
MARCO  
Changes in goodwill by business segment  
Acquisitions $ 0.3