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SPECIAL CHARGES - Realignment Expenses (Details)
$ in Millions
1 Months Ended
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
employee
Facility Closing    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   $ 10.2
Expected number of positions eliminated | employee   232
Defined benefit pension plans    
Restructuring Cost and Reserve [Line Items]    
Gain due to curtailment $ 7.1