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PROPERTY, BUILDINGS AND EQUIPMENT - PROPERTY, BUILDINGS AND EQUIPMENT (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 17.1 $ 17.8 $ 18.5
Capitalized software amortization 10.6 10.3 $ 10.5
Unamortized software cost 21.6 24.5  
Capitalized leases 12.0 12.5  
Accumulated amortization related to capitalized leases $ 8.9 $ 8.3