Quarterly report pursuant to Section 13 or 15(d)

REVENUE (Deferred Revenue) (Details)

v3.19.1
REVENUE (Deferred Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Deferred Revenue Arrangement [Line Items]        
Contract with Customer, Liability, Current $ 18.1 $ 31.0 $ 21.0 $ 23.8
Other Liabilities [Member]        
Deferred Revenue Arrangement [Line Items]        
Contract with Customer, Liability, Noncurrent 38.5 51.4 $ 38.5 $ 51.4
Other Current Liabilities [Member]        
Deferred Revenue Arrangement [Line Items]        
Contract With Customer, Liability, Period Increase (Decrease) (2.9) 7.2    
Other Noncurrent Liabilities [Member]        
Deferred Revenue Arrangement [Line Items]        
Contract With Customer, Liability, Period Increase (Decrease) $ 0.0 $ 0.0