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Quarterly Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information Earnings per share for each quarter and the year are calculated individually and may not sum to the total for the year.
 
2018
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Year
Net sales
$
1,658.9

 
$
1,746.6

 
$
1,735.6

 
$
1,677.1

 
$
6,818.2

Operating profit (loss)
63.6

 
99.5

 
114.8

 
86.5

 
364.4

Net income (loss) attributable to AK Holding
28.7

 
56.6

 
67.2

 
33.5

 
186.0

Basic and diluted earnings (loss) per share
$
0.09

 
$
0.18

 
$
0.21

 
$
0.11

 
$
0.59

 
 
 
 
 
 
 
 
 
 
 
2017
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Year
Net sales
$
1,533.4

 
$
1,557.2

 
$
1,494.3

 
$
1,495.6

 
$
6,080.5

Operating profit (loss)
129.7

 
116.5

 
66.3

 
(52.3
)
 
260.2

Net income (loss) attributable to AK Holding
84.4

 
77.2

 
22.3

 
(80.4
)
 
103.5

Basic earnings (loss) per share
$
0.27

 
$
0.25

 
$
0.07

 
$
(0.26
)
 
$
0.33

Diluted earnings (loss) per share
0.26

 
0.24

 
0.07

 
(0.26
)
 
0.32