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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
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
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

2015 -
 
 
 
 
 
 
 
 
Sales
 
$
1,125.5

 
$
1,022.5

 
$
832.7

 
$
738.9

Gross Profit (loss)
 
109.5

 
77.0

 
(28.7
)
 
(97.5
)
Net income (loss)
 
12.6

 
(13.9
)
 
(141.3
)
 
(223.3
)
Net income (loss) attributable to ATI
 
10.0

 
(16.4
)
 
(144.6
)
 
(226.9
)
Basic income (loss) attributable to ATI per common share
 
$
0.09

 
$
(0.15
)
 
$
(1.35
)
 
$
(2.12
)
Diluted income (loss) attributable to ATI per common share
 
$
0.09

 
$
(0.15
)
 
$
(1.35
)
 
$
(2.12
)
Average shares outstanding
 
108.9

 
109.2

 
109.2

 
109.2