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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2019
Commitments and Contingencies [Abstract]  
Operating Leases
The following table presents information regarding our operating leases where we are the lessee at September 30, 2019:

Asset Category
ROU
Asset
Carrying
Value (1)
  
Lease
Liability Carrying
    Value (2)
  
Weighted-
Average
Remaining
Term
  
Weighted-
Average
Discount
Rate (3)
Storage and pipeline facilities
$
141.0
  
$
141.6
  
16 years
  
4.3%
Transportation equipment
  
            54.2
    
            56.6
  
4 years
  
3.4%
Office and warehouse space
  
            24.3
    
            22.9
  
2 years
  
3.5%
Total
$
 219.5
  
$
221.1
        

(1)
ROU asset amounts are a component of “Other assets” on our consolidated balance sheet.
(2)
At September 30, 2019, lease liabilities of $39.2 million and $181.9 million were included within “Other current liabilities” and “Other liabilities,” respectively.
(3)
The discount rate for each category of assets represents the weighted average of either (i) the implicit rate applicable to the underlying leases (where determinable) or (ii) our incremental borrowing rate adjusted for collateralization (if the implicit rate is not determinable).  In general, the discount rates are based on either (i) information available at the lease commencement date or (ii) January 1, 2019 for leases existing at the adoption date for ASC 842.
Consolidated Lease Expense

 
For the Three Months
Ended September 30, 2019
    
For the Nine Months
Ended September 30, 2019
  
Long-term operating leases:
            
   Fixed lease expense
  
$
12.8
    
$
39.3
  
   Variable lease expense
    
1.6
      
4.5
  
Subtotal operating lease expense
    
14.4
      
43.8
  
Short-term lease expense
    
12.4
      
35.9
  
Total operating lease expense
  
$
26.8
    
$
79.7