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Derivatives (Tables)
 12 Months Ended
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of derivative assets and liabilities at fair value
The following table sets forth the Company's derivative assets and liabilities that were accounted for at fair value and not designated as cash flow hedges as of December 31, 2019 and 2018:
 
Asset Fair Value
 
2019
 
2018
Commodity contracts (1)
$
19.7

 
$
8.2

Foreign exchange contracts (2)
—

 
—

Total
$
19.7

 
$
8.2

 
Liability Fair Value
 
2019
 
2018
Commodity contracts (1)
$
3.6

 
$
2.2

Foreign exchange contracts (2)
0.6

 
0.3

Total
$
4.2

 
$
2.5


(1) Commodity contracts reflect our outstanding LME forward financial sales contracts, MWP forward financial sales contracts, Hawesville L4 power price swaps, fixed for floating swaps, and Nord Pool power price swaps.
(2) Foreign exchange contracts reflect our outstanding FX swaps.
Schedule of net gain (loss) on forward and derivative contracts
The following table summarizes the net gain (loss) on forward and derivative contracts for the years ended December 31, 2019, 2018, and 2017:
 
Year Ended December 31,
 
2019
 
2018
 
2017
Commodity contracts
$
12.9

 
$
6.6

 
$
(16.5
)
Foreign exchange contracts
(0.9
)
 
(0.3
)
 
—

   Total
$
12.0

 
$
6.3

 
$
(16.5
)