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ACQUISITIONS (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Jan. 26, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 865.7   $ 774.7
Axtone Railway Components Acquisition [Member]      
Business Acquisition [Line Items]      
Cash   $ 9.4  
Receivables   11.5  
Inventory   11.7  
Plant, property and equipment   14.1  
Goodwill   89.0  
Other assets   5.3  
Accounts payable and accrued liabilities   (12.0)  
Postretirement liabilities   (3.8)  
Other liabilities   (2.1)  
Net assets acquired   $ 123.1