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PROPERTY, BUILDINGS AND EQUIPMENT - PROPERTY, BUILDINGS AND EQUIPMENT (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 15.9 $ 17.3 $ 16.3
Capitalized software amortization 10.6 9.8 $ 9.9
Unamortized software cost 29.8 24.2  
Capitalized leases 9.7 9.3  
Accumulated amortization related to capitalized leases $ 8.3 $ 8.4