Quarterly report pursuant to Section 13 or 15(d)

REVENUE (Deferred Revenue) (Details)

v3.19.2
REVENUE (Deferred Revenue) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Deferred Revenue Arrangement [Line Items]          
Contract with Customer, Liability, Current $ 15.5   $ 21.0 $ 20.0 $ 23.8
Other Liabilities [Member]          
Deferred Revenue Arrangement [Line Items]          
Contract with Customer, Liability, Noncurrent 34.3   $ 38.5 $ 47.1 $ 51.4
Other Current Liabilities [Member]          
Deferred Revenue Arrangement [Line Items]          
Contract With Customer, Liability, Period Increase (Decrease) (5.5) $ (3.8)      
Other Noncurrent Liabilities [Member]          
Deferred Revenue Arrangement [Line Items]          
Contract With Customer, Liability, Period Increase (Decrease) $ (4.2) $ (4.3)