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Financial Information for Subsidiary and Guarantor Parent (I.S.) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Income Statement [Abstract] |  |
Sales | $ 979.0 | $ 865.9
Cost of sales | 830.4 | 741.1
Gross profit (loss) | 148.6 | 124.8
Selling and administrative expenses | 67.1 | 57.9
Operating income (loss) | 81.5 | 66.9
Nonoperating retirement benefit expense | (8.3) | (13.6)
Interest income (expense), net | (25.5) | (33.5)
Other income (loss) including equity in income of unconsolidated subsidiaries | 17.8 | 3.3
Income (loss) before income tax provision (benefit) | 65.5 | 23.1
Income tax provision (benefit) | 5.0 | 2.0
Net income (loss) | 60.5 | 21.1
Less: Net income attributable to noncontrolling interests | 2.5 | 3.6
Net income (loss) attributable to ATI | 58.0 | 17.5
Comprehensive income (loss) attributable to ATI | 93.6 | 39.8
Reportable Legal Entities | Parent Company |  |
Income Statement [Abstract] |  |
Sales | 0.0 | 0.0
Cost of sales | 4.1 | 4.0
Gross profit (loss) | (4.1) | (4.0)
Selling and administrative expenses | 23.7 | 20.1
Operating income (loss) | (27.8) | (24.1)
Nonoperating retirement benefit expense | (3.1) | (8.1)
Interest income (expense), net | (33.0) | (38.6)
Other income (loss) including equity in income of unconsolidated subsidiaries | 129.4 | 93.9
Income (loss) before income tax provision (benefit) | 65.5 | 23.1
Income tax provision (benefit) | 5.0 | 2.0
Net income (loss) | 60.5 | 21.1
Less: Net income attributable to noncontrolling interests | 0.0 | 0.0
Net income (loss) attributable to ATI | 60.5 | 21.1
Comprehensive income (loss) attributable to ATI | 103.0 | 45.4
Reportable Legal Entities | Subsidiary |  |
Income Statement [Abstract] |  |
Sales | 346.4 | 287.2
Cost of sales | 323.2 | 255.6
Gross profit (loss) | 23.2 | 31.6
Selling and administrative expenses | 10.3 | 9.5
Operating income (loss) | 12.9 | 22.1
Nonoperating retirement benefit expense | (4.9) | (4.7)
Interest income (expense), net | (25.7) | (21.2)
Other income (loss) including equity in income of unconsolidated subsidiaries | 16.8 | 0.5
Income (loss) before income tax provision (benefit) | (0.9) | (3.3)
Income tax provision (benefit) | 0.2 | (1.1)
Net income (loss) | (1.1) | (2.2)
Less: Net income attributable to noncontrolling interests | 0.0 | 0.0
Net income (loss) attributable to ATI | (1.1) | (2.2)
Comprehensive income (loss) attributable to ATI | 1.3 | (0.3)
Reportable Legal Entities | NonGuarantor Subsidiaries |  |
Income Statement [Abstract] |  |
Sales | 632.6 | 578.7
Cost of sales | 503.1 | 481.5
Gross profit (loss) | 129.5 | 97.2
Selling and administrative expenses | 33.1 | 28.3
Operating income (loss) | 96.4 | 68.9
Nonoperating retirement benefit expense | (0.3) | (0.8)
Interest income (expense), net | 33.2 | 26.3
Other income (loss) including equity in income of unconsolidated subsidiaries | 0.5 | 2.8
Income (loss) before income tax provision (benefit) | 129.8 | 97.2
Income tax provision (benefit) | 20.2 | 35.5
Net income (loss) | 109.6 | 61.7
Less: Net income attributable to noncontrolling interests | 2.5 | 3.6
Net income (loss) attributable to ATI | 107.1 | 58.1
Comprehensive income (loss) attributable to ATI | 124.0 | 45.9
Eliminations |  |
Income Statement [Abstract] |  |
Sales | 0.0 | 0.0
Cost of sales | 0.0 | 0.0
Gross profit (loss) | 0.0 | 0.0
Selling and administrative expenses | 0.0 | 0.0
Operating income (loss) | 0.0 | 0.0
Nonoperating retirement benefit expense | 0.0 | 0.0
Interest income (expense), net | 0.0 | 0.0
Other income (loss) including equity in income of unconsolidated subsidiaries | (128.9) | (93.9)
Income (loss) before income tax provision (benefit) | (128.9) | (93.9)
Income tax provision (benefit) | (20.4) | (34.4)
Net income (loss) | (108.5) | (59.5)
Less: Net income attributable to noncontrolling interests | 0.0 | 0.0
Net income (loss) attributable to ATI | (108.5) | (59.5)
Comprehensive income (loss) attributable to ATI | $ (134.7) | $ (51.2)

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