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REGULATORY MATTERS
 9 Months Ended
Sep. 30, 2017
Regulatory Assets and Liabilities Disclosure [Abstract]  
REGULATORY MATTERS
5. REGULATORY MATTERS
Regulatory Accounting
Due to over or under revenue recovery adjustments made in accordance with the Federal Energy Regulatory Commission (FERC), authoritative guidance and our cost-of-service recovery model, we recognize assets and liabilities for regulatory purposes. The assets and liabilities that we recognize for regulatory purposes are recorded on a net basis in “Other current assets” or “Accounts payable and other,” respectively, on our consolidated statements of financial position. These regulatory assets and liabilities are amortized on a straight-line basis over a one-year recovery period. Our over and under recovery revenue adjustments and net regulatory asset amortization for the three and nine months ended September 30, 2017 and 2016 are as follows:
 
Three months ended September 30,
 
Nine months ended September 30,
  
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
  
(in millions)
Net regulatory asset (liability) balance at beginning of period
$
(23.7
)
 
$
29.3

 
$
11.9

 
$
29.9

Current period under recovery revenue adjustments
28.8

 
6.4

 
1.8

 
20.0

Amortization of prior year regulatory asset
(1.6
)
 
(7.9
)
 
(10.2
)
 
(22.1
)
Net regulatory asset balance at end of period
$
3.5

 
$
27.8

 
$
3.5

 
$
27.8