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PROPERTY AND EQUIPMENT. (Leased) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Rental expense $ 36.0 $ 32.8 $ 31.1
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Future minimum operating lease payments, due in 2018 37.8    
Future minimum operating lease payments, due in 2019 37.2    
Future minimum operating lease payments, due in 2020 32.9    
Future minimum operating lease payments, due in 2021 29.6    
Future minimum operating lease payments, due in 2022 24.6    
Future minimum operating lease payments, due in later years $ 100.5