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Financial Information for Subsidiary and Guarantor Parent (Comp Inc.) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss | $ 5.2 | $ (119.4) | $ 13.4 | $ 21.1 | $ 13.7 | $ (527.2) | $ (15.5) | $ (98.1) | $ (79.7) | $ (627.1) | $ (365.9)
Currency translation adjustment arising during the period |  |  |  |  |  |  |  |  | 39.1 | (47.1) | (37.0)
Net derivative loss on hedge transactions |  |  |  |  |  |  |  |  | 7.1 | 19.6 | (32.0)
Pension and postretirement benefits |  |  |  |  |  |  |  |  | 27.3 | (61.4) | (19.7)
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 73.5 | (88.9) | (88.7)
Comprehensive loss |  |  |  |  |  |  |  |  | (6.2) | (716.0) | (454.6)
Less: Comprehensive income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 19.8 | 4.1 | 6.4
Comprehensive loss attributable to ATI |  |  |  |  |  |  |  |  | (26.0) | (720.1) | (461.0)
Legal Entities [Member] | Guarantor Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  | (79.7) | (627.1) | (365.9)
Currency translation adjustment arising during the period |  |  |  |  |  |  |  |  | 39.1 | (47.1) | (37.0)
Net derivative loss on hedge transactions |  |  |  |  |  |  |  |  | 7.1 | 19.6 | (32.0)
Pension and postretirement benefits |  |  |  |  |  |  |  |  | 27.3 | (61.4) | (19.7)
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 73.5 | (88.9) | (88.7)
Comprehensive loss |  |  |  |  |  |  |  |  | (6.2) | (716.0) | (454.6)
Less: Comprehensive income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Comprehensive loss attributable to ATI |  |  |  |  |  |  |  |  | (6.2) | (716.0) | (454.6)
Legal Entities [Member] | Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  | (34.0) | (160.0) | (288.1)
Currency translation adjustment arising during the period |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net derivative loss on hedge transactions |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Pension and postretirement benefits |  |  |  |  |  |  |  |  | (5.8) | 17.2 | 29.8
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | (5.8) | 17.2 | 29.8
Comprehensive loss |  |  |  |  |  |  |  |  | (39.8) | (142.8) | (258.3)
Less: Comprehensive income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Comprehensive loss attributable to ATI |  |  |  |  |  |  |  |  | (39.8) | (142.8) | (258.3)
Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  | 158.9 | (140.2) | 158.9
Currency translation adjustment arising during the period |  |  |  |  |  |  |  |  | 39.1 | (47.1) | (37.0)
Net derivative loss on hedge transactions |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Pension and postretirement benefits |  |  |  |  |  |  |  |  | (10.7) | 1.8 | 3.1
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 28.4 | (45.3) | (33.9)
Comprehensive loss |  |  |  |  |  |  |  |  | 187.3 | (185.5) | 125.0
Less: Comprehensive income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 19.8 | 4.1 | 6.4
Comprehensive loss attributable to ATI |  |  |  |  |  |  |  |  | 167.5 | (189.6) | 118.6
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  | (124.9) | 300.2 | 129.2
Currency translation adjustment arising during the period |  |  |  |  |  |  |  |  | (39.1) | 47.1 | 37.0
Net derivative loss on hedge transactions |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Pension and postretirement benefits |  |  |  |  |  |  |  |  | 16.5 | (19.0) | (32.9)
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | (22.6) | 28.1 | 4.1
Comprehensive loss |  |  |  |  |  |  |  |  | (147.5) | 328.3 | 133.3
Less: Comprehensive income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Comprehensive loss attributable to ATI |  |  |  |  |  |  |  |  | $ (147.5) | $ 328.3 | $ 133.3

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