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PROPERTY, BUILDINGS AND EQUIPMENT - PROPERTY, BUILDINGS AND EQUIPMENT (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 17.3 $ 16.3 $ 17.1
Capitalized software amortization 9.8 9.9 $ 10.6
Unamortized software cost 24.2 22.4  
Capitalized leases 9.3 10.6  
Accumulated amortization related to capitalized leases $ 8.4 $ 9.0