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PROPERTY, BUILDINGS AND EQUIPMENT - PROPERTY, BUILDINGS AND EQUIPMENT (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 16.3 $ 17.1 $ 17.8
Capitalized software amortization 9.9 10.6 $ 10.3
Unamortized software cost 22.4 21.6  
Capitalized leases 10.6 12.0  
Accumulated amortization related to capitalized leases $ 9.0 $ 8.9