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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
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
2017 -
 
 
 
 
 
 
 
 
Sales
 
$
865.9

 
$
880.2

 
$
869.1

 
$
909.9

Gross Profit
 
112.8

 
112.3

 
93.3

 
130.6

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

2016 -
 
 
 
 
 
 
 
 
Sales
 
$
757.5

 
$
810.5

 
$
770.5

 
$
796.1

Gross Profit (loss)
 
(33.2
)
 
48.2

 
50.2

 
97.3

Net income (loss)
 
(98.1
)
 
(15.5
)
 
(527.2
)
 
13.7

Net income (loss) attributable to ATI
 
(101.2
)
 
(18.8
)
 
(530.8
)
 
9.9

Basic income (loss) attributable to ATI per common share
 
$
(0.94
)
 
$
(0.18
)
 
$
(4.95
)
 
$
0.09

Diluted income (loss) attributable to ATI per common share
 
$
(0.94
)
 
$
(0.18
)
 
$
(4.95
)
 
$
0.09

Average shares outstanding
 
109.0

 
108.9

 
108.9

 
108.9