Quarterly report pursuant to Section 13 or 15(d)

REVENUE (Deferred Revenue) (Details)

v3.8.0.1
REVENUE (Deferred Revenue) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue, Noncurrent $ 51.4 $ 51.4
Deferred Revenue, Current 31.0 $ 23.8
Other Current Liabilities [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue, Period Increase (Decrease) 7.2  
Other Noncurrent Liabilities [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue, Period Increase (Decrease) $ 0.0