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REVENUE (Tables)
 9 Months Ended
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]  
Deferred Revenue Disclosure
The table below summarizes our deferred revenue balances:
 
Deferred Revenue (Current)1
 
Deferred Revenue (Long-Term)
Opening balance as of January 1, 2018
$
23.8

 
$
51.4

Closing balance as of September 30, 2018
16.1

 
42.8

Decrease
$
(7.7
)
 
$
(8.6
)
 
 
 
 
1 The opening balance includes a $1.4 million adjustment from the December 31, 2017 balance due to the adoption of Topic 606.