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INCOME TAXES - Tax credits (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Tax credits  
Tax credit carryforwards $ 24.9
Deferred tax assets, tax credit carryforwards 20.1
Equity compensation 2.3
Foreign  
Tax credits  
Amount of foreign tax credit carryforwards 20.1
Minimum tax credit carryforwards $ 2.5