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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information
 
 
Quarter Ended
(In millions, except per share amounts)
 
March 31
 
June 30
 
September 30
 
December 31
2018 -
 
 
 
 
 
 
 
 
Sales
 
$
979.0

 
$
1,009.5

 
$
1,020.2

 
$
1,037.9

Gross Profit
 
148.6

 
173.7

 
160.4

 
147.6

Net income
 
60.5

 
75.6

 
55.6

 
45.0

Net income attributable to ATI
 
58.0

 
72.8

 
50.5

 
41.1

Basic income attributable to ATI per common share
 
$
0.46

 
$
0.58

 
$
0.40

 
$
0.33

Diluted income attributable to ATI per common share
 
$
0.42

 
$
0.52

 
$
0.37

 
$
0.30

Average shares outstanding
 
125.7

 
125.7

 
125.7

 
125.7

2017 -
 
 
 
 
 
 
 
 
Sales
 
$
865.9

 
$
880.2

 
$
869.1

 
$
909.9

Gross Profit
 
124.8

 
124.3

 
105.3

 
142.6

Net income (loss)
 
21.1

 
13.4

 
(119.4
)
 
5.2

Net income (loss) attributable to ATI
 
17.5

 
10.1

 
(121.2
)
 
1.7

Basic income (loss) attributable to ATI per common share
 
$
0.16

 
$
0.09

 
$
(1.12
)
 
$
0.01

Diluted income (loss) attributable to ATI per common share
 
$
0.16

 
$
0.09

 
$
(1.12
)
 
$
0.01

Average shares outstanding
 
108.8

 
108.9

 
108.9

 
118.6