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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information
 Quarter Ended
(In millions, except per share amounts)March 31June 30September 30December 31
2020 -
Sales$955.5 $770.3 $598.0 $658.3 
Gross Profit 134.8 74.7 38.1 45.2 
Net income (loss)23.6 (419.9)(47.0)(1,116.3)
Net income (loss) attributable to ATI21.1 (422.6)(50.1)(1,121.0)
Basic income (loss) attributable to ATI per common share$0.17 $(3.34)$(0.40)$(8.85)
Diluted income (loss) attributable to ATI per common share$0.16 $(3.34)$(0.40)$(8.85)
Average shares outstanding126.3 126.7 126.8 126.8 
2019 -
Sales$1,004.8 $1,080.4 $1,018.7 $1,018.6 
Gross Profit 131.1 177.7 159.7 169.3 
Net income 16.3 78.5 115.3 60.0 
Net income attributable to ATI15.0 75.1 111.0 56.5 
Basic income attributable to ATI per common share$0.12 $0.60 $0.88 $0.45 
Diluted income attributable to ATI per common share$0.12 $0.54 $0.78 $0.41 
Average shares outstanding125.8 126.1 126.1 126.1