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Quarterly Information (Unaudited)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Data [Abstract]  
Quarterly Information (Unaudited)
Quarterly Information (Unaudited)
Financial results by quarter for the years ended December 31, 2018 and 2017 are as follows:
 
Net sales
 
Gross profit (loss)
 
Net income (loss)
 
Net income (loss) allocated to common stockholders
 
Basic
earnings (loss) per share
 
Diluted earnings (loss) per share
2018
 
 
 
 
 
 
 
 
 
 
 
4th Quarter (1)
$
486.9

 
$
(59.3
)
 
$
(65.0
)
 
$
(65.0
)
 
$
(0.74
)
 
$
(0.74
)
3rd Quarter (2)
481.8

 
(11.8
)
 
(20.3
)
 
(20.3
)
 
(0.23
)
 
(0.23
)
2nd Quarter (3)
470.0

 
33.7

 
19.4

 
17.9

 
0.20

 
0.20

1st Quarter
454.5

 
14.5

 
(0.3
)
 
(0.3
)
 
(0.00
)
 
(0.00
)
2017
 

 
 

 
 

 
 

 
 

 
 
4th Quarter (4)
$
433.9

 
$
47.9

 
$
35.8

 
$
33.0

 
$
0.38

 
$
0.37

3rd Quarter
400.6

 
41.4

 
20.8

 
19.1

 
0.22

 
0.22

2nd Quarter
388.8

 
22.5

 
7.1

 
6.6

 
0.08

 
0.07

1st Quarter (5)
365.8

 
16.8

 
(15.1
)
 
(15.1
)
 
(0.17
)
 
(0.17
)

(1) 
The fourth quarter of 2018 was unfavorably impacted by realization of a lower of cost or net realizable value adjustment of $30.6 million.
(2) 
The third quarter of 2018 was favorably impacted by a $4.5 million gain on the extinguishment of the remainder of our contractual commitments associated with the construction of the Helguvik project.
(3) 
The second quarter of 2018 reflects our temporary curtailment of one potline at our Sebree aluminum smelter due to an equipment failure that was brought back online in the third quarter.
(4) 
The fourth quarter of 2017 was favorably impacted by a $7.3 million gain on the extinguishment of a portion of our contractual commitments associated with the construction of the Helguvik project.
(5) 
The first quarter of 2017 was unfavorably impacted by net losses on forward and derivative contracts of $16.1 million.