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Accumulated Other Comprehensive Income (Loss) (Details2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amortization to net income (loss) of net prior service cost (credits) $ (2.6) $ (1.6) $ (0.4)
Amortization of net actuarial loss 76.5 71.6 75.0
Cost of sales (3,416.3) (3,028.1) (2,911.8)
Income (loss) before income taxes 247.7 (86.5) (734.0)
Income tax provision (benefit) 11.0 (6.8) (106.9)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Post- retirement benefit plans [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amortization to net income (loss) of net prior service cost (credits) [1] 2.6 1.6 0.4
Amortization of net actuarial loss [1] (76.5) (71.6) (75.0)
Income (loss) before income taxes [2] (73.9) (70.0) (74.6)
Income tax provision (benefit) [3] (18.0) (26.5) (28.3)
Income (loss) (55.9) (43.5) (46.3)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income (loss) before income taxes [2] 11.7 7.2 (7.9)
Income tax provision (benefit) [3] 2.8 2.7 (3.0)
Income (loss) 8.9 4.5 (4.9)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Nickel and other raw material contracts [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of sales [4] 10.2 (3.4) (19.5)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Natural gas contracts [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of sales [4] 0.5 (5.3)  
Cost of Goods Sold and Selling, General and Administrative Expenses [4]     (14.8)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Electricity contracts [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of sales [4] 0.0 0.0 0.0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Foreign Exchange Contract [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of sales [4] 1.3 15.9 26.4
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Interest Rate Swap [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest Expense [4] $ (0.3) $ 0.0 $ 0.0
[1] Amounts are included in nonoperating retirement benefit expense (see Note 12).
[2] For pretax items, positive amounts are income and negative amounts are expense in terms of the impact to net income. Tax effects are presented in conformity with ATI’s presentation in the consolidated statements of operations.
[3] These amounts exclude the impact of any deferred tax asset valuation allowances, when applicable (see Note 15 for further explanation).
[4] For 2018, following the Company’s January 1, 2018 adoption of changes issued by the FASB related to accounting guidance for derivatives, amounts related to derivatives, with the exception of the interest rate swap are included in cost of goods sold in the period or periods the hedged item affects earnings. Amounts related to the interest rate swap are included in interest expense in the same period as the interest expense on the Term Loan is recognized in earnings (see Note 10). For 2016 and 2017, amounts related to the effective portion of the derivatives were included in cost of goods sold in the period or periods the hedged item affects earnings, and amounts related to the ineffective portion of the derivatives were presented in selling and administrative expenses on the consolidated statements of operations (see Note 10).