Derivatives (Tables)

12 Months Ended

Dec. 31, 2018

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 hedging instruments as of December 31, 2018 and 2017:



	Asset Fair Value
	2018		2017
Commodity contracts⁽¹⁾	$	8.2	$	1.7
Foreign exchange contracts⁽²⁾	—		—
Total	$	8.2	$	1.7



	Liability Fair Value
	2018		2017
Commodity contracts ⁽¹⁾	$	2.2	$	1.2
Foreign exchange contracts⁽²⁾	0.3		—
Total	$	2.5	$	1.2

⁽¹⁾Commodity contracts reflect our outstanding LME forward financial sales contracts, MWP forward financial sales contracts, fixed for floating swaps, and 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, 2018, 2017, and 2016:



	Year Ended December 31,
	2018			2017			2016
Commodity contracts	$	6.6		$	(16.5	)	$	3.5
Foreign exchange contracts	(0.3		)	—			—
Total	$	6.3		$	(16.5	)	$	3.5

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

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+ Details