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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position The following table presents the fair value of our derivative instruments as of December 31, 2018 and 2017. 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 consolidated balance sheets. See Note 13 for further information regarding the fair value of derivative instruments (in millions):
 
 
 
December 31, 2018
 
December 31, 2017
Derivative Type
Balance Sheet Location
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
 
Commodity derivatives(1)
Other current assets
 
$
158.3

 
$
(142.4
)
 
$
164.6

 
$
(162.0
)
Commodity derivatives(1)
Other current liabilities
 
—

 
(8.4
)
 
13.4

 
(28.3
)
Commodity derivatives(1)
Other long-term assets
 
2.1

 
(2.4
)
 
—

 
—

Commodity derivatives(1)
Other long-term liabilities
 
93.0

 
(94.0
)
 
—

 
—

RIN commitment contracts(2)
Other current assets
 
2.0

 
—

 
1.4

 
—

RIN commitment contracts(2)
Other current liabilities
 
—

 
(6.7
)
 
—

 
(24.0
)
Derivatives designated as hedging instruments:
 
 
 
 
 
 
 
 
Commodity derivatives(1)
Other current assets
 
200.3

 
(157.0
)
 
—

 
—

Commodity derivatives(1)
Other current liabilities
 
—

 
—

 
—

 
(13.6
)
Commodity derivatives(1)
Other long-term assets
 
6.1

 
(4.8
)
 
—

 
—

Interest rate derivatives
Other long-term liabilities
 
—

 
—

 
—

 
(0.9
)
Total gross fair value of derivatives
 
461.8

 
(415.7
)
 
179.4

 
(228.8
)
Less: Counterparty netting and cash collateral(3)
 
399.9

 
(399.5
)
 
163.5

 
(173.6
)
Total net fair value of derivatives
 
$
61.9

 
$
(16.2
)
 
$
15.9

 
$
(55.2
)
(1) 
As of December 31, 2018 and 2017, we had open derivative positions representing 39,277,822 and 35,978,000 barrels, respectively, of crude oil and refined petroleum products. Of these open positions, contracts representing 16,461,000 and 575,000 barrels were designated as cash flow hedging instruments as of December 31, 2018 and 2017, respectively.
(2) 
As of December 31, 2018 and 2017, we had open RIN commitment contracts representing 137,750,000 and 163,361,320 RINs, respectively.
(3) 
As of December 31, 2018 and 2017, $(0.4) million and $10.0 million, respectively, of cash (obligation) collateral held by counterparties has been netted with the derivatives with each counterparty.
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position Total losses on our commodity derivatives and RIN commitment contracts recorded in cost of materials and other on the consolidated statements of income are as follows (in millions):
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Gains (losses) on commodity derivatives not designated as hedging instruments recognized in cost of materials and other (1)
 
$
0.9

 
$
(33.1
)
 
$
(21.7
)
Gains on commodity derivatives not designated as hedging instruments recognized in other operating income (expenses), net (1) (2)
 
7.7

 
—

 
—

Realized losses reclassified out of OCI on commodity derivatives designated as cash flow hedging instruments
 
(1.7
)
 
(38.6
)
 
(27.8
)
Gains recognized on commodity derivatives due to cash flow hedging ineffectiveness
 
0.9

 
0.5

 
3.1

Total income (losses)
 
$
7.8

 
$
(71.2
)
 
$
(46.4
)

(1)
Gains (losses) on commodity derivatives that are economic hedges but not designated as hedging instruments include unrealized gains (losses) of $32.1 million, $(13.0) million and $(34.2) million for the years ended December 31, 2018, 2017 and 2016, respectively. Of these amounts, approximately $8.1 million and $4.6 million for the years ended December 31, 2018 and 2017, respectively, represent unrealized gains where the instrument has matured but where it has not cash settled as of period end, excluding the reversal of prior period settlement 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."
Derivative Instruments, Gain (Loss) 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):
 
 
Year Ended December 31, 2018
Realized gains
 
$
23.1

Unrealized losses
 
(3.0
)
 Total
 
$
20.1