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Derivative Instruments (Tables)
3 Months Ended
Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Fair Value of Derivatives Instruments Statements The following table presents the fair value of our derivative instruments as of March 31, 2019 and December 31, 2018. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under our master netting arrangements, including cash collateral on deposit with our counterparties. We have elected to offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements. As a result, the asset and liability amounts below differ from the amounts presented in our condensed consolidated balance sheets. See Note 12 for further information regarding the fair value of derivative instruments (in millions):
 
 
 
March 31, 2019
 
December 31, 2018
Derivative Type
Balance Sheet Location
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
 
Commodity derivatives(1)
Other current assets
 
$
100.7

 
$
(101.9
)
 
$
158.3

 
$
(142.4
)
Commodity derivatives(1)
Other current liabilities
 
7.4

 
(12.5
)
 

 
(8.4
)
Commodity derivatives(1)
Other long-term assets
 
0.6

 
(0.4
)
 
2.1

 
(2.4
)
Commodity derivatives(1)
Other long-term liabilities
 
25.3

 
(30.3
)
 
93.0

 
(94.0
)
RIN commitment contracts(2)
Other current assets
 
4.0

 

 
2.0

 

RIN commitment contracts(2)
Other current liabilities
 

 
(6.4
)
 

 
(6.7
)
 
 
 
 
 
 
 
 
 
 
Derivatives designated as hedging instruments:
 
 
 
 
 
 
 
 
Commodity derivatives (1)
Other current assets
 
76.4

 
(27.2
)
 
200.3

 
(157.0
)
Commodity derivatives (1)
Other current liabilities
 
0.5

 
(0.3
)
 

 

Commodity derivatives (1)
Other long-term assets
 
2.5

 
(1.8
)
 
6.1

 
(4.8
)
Total gross fair value of derivatives
 
$
217.4

 
$
(180.8
)
 
$
461.8

 
$
(415.7
)
Less: Counterparty netting and cash collateral(3)
 
183.0

 
(161.6
)
 
399.9

 
(399.5
)
Total net fair value of derivatives
 
$
34.4

 
$
(19.2
)
 
$
61.9

 
$
(16.2
)
(1) 
As of March 31, 2019 and December 31, 2018, we had open derivative positions representing 67,840,734 and 39,277,822 barrels, respectively, of crude oil and refined petroleum products. Of these open positions, contracts representing 9,093,000 and 16,461,000 barrels were designated as cash flow hedging instruments as of March 31, 2019 and December 31, 2018, respectively.
(2) 
As of March 31, 2019 and December 31, 2018, we had open RIN commitment contracts representing 256,025,000 and 137,750,000 RINs, respectively.
(3) 
As of March 31, 2019 and December 31, 2018, $21.4 million and $0.4 million, respectively, of cash obligation held by counterparties has been netted with the derivatives with each counterparty.

Total gains (losses) on our hedging derivatives and RIN commitment contracts recorded in cost of materials and other on the condensed consolidated statements of income are as follows (in millions):
 
 
Three Months Ended March 31,
 
 
2019
 
2018
Gains (losses) on commodity derivatives not designated as hedging instruments recognized in cost of materials and other (1)
 
$
38.9

 
$
(9.3
)
Losses on commodity derivatives not designated as hedging instruments recognized in other operating income (expense), net (1) (2)
 
(2.3
)
 

Realized losses reclassified out of OCI on commodity derivatives designated as cash flow hedging instruments
 
(19.1
)
 

 Total gains (losses)
 
$
17.5

 
$
(9.3
)

(1)
Gains (losses) on commodity derivatives that are economic hedges but not designated as hedging instruments include unrealized gains (losses) of $(27.1) million and $(14.8) million for the three months ended March 31, 2019 and 2018, respectively. Of these amounts, approximately $(5.6) million and $(2.4) million for the three months ended March 31, 2019 and 2018, respectively, represent unrealized gains (losses) where the instrument has matured but where it has not cash settled as of period end, excluding the reversal of prior period settlement timing differences. Derivative instruments that have matured but not cash settled at the balance sheet date continue to be reflected in derivative assets or liabilities on our balance sheet.
(2) 
See separate table below for disclosures about "trading derivatives."

The effect of cash flow hedge accounting on the consolidated statement of income is as follows (in millions) for the three months ended March 31, 2019:
Gain (loss) on cash flow hedging relationships recognized in cost of materials and other:
 
 
Commodity contracts:
 
 
Hedged items
 
$
19.1

Derivative designated as hedging instruments
 
(19.1
)
Total
 
$

Total gains on our trading forward contract derivatives (none of which were designated as hedging instruments) recorded in other operating income (expense), net on the condensed consolidated statements of income are as follows (in millions):
 
 
Three Months Ended March 31,
 
 
2019
Realized gains
 
$
3.9

Unrealized gains
 
2.1

 Total
 
$
6.0