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Financial Information for Subsidiary and Guarantor Parent (Comp Inc.) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss) $ 175.6 $ (32.2) $ 6.6 $ 11.6 $ 13.5 $ 37.3 $ 58.7 $ 58.3 $ 161.6 $ 167.8 $ 223.1
Currency translation adjustment arising during the period                 15.3 14.3 2.7
Unrealized holding gain (loss) on securities                 0.1 0 (0.1)
Net derivative gain (loss) on hedge transactions                 (6.9) (2.8) 3.8
Pension and postretirement benefits                 311.1 (97.4) (277.1)
Other comprehensive income (loss), net of tax                 319.6 (85.9) (270.7)
Comprehensive income (loss)                 481.2 81.9 (47.6)
Less: Comprehensive income attributable to noncontrolling interest                 11.0 11.3 14.6
Comprehensive income (loss) attributable to ATI                 470.2 70.6 (62.2)
Guarantor Parent [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 161.6 167.8 223.1
Currency translation adjustment arising during the period                 15.3 14.3 2.7
Unrealized holding gain (loss) on securities                 0.1   (0.1)
Net derivative gain (loss) on hedge transactions                 (6.9) (2.8) 3.8
Pension and postretirement benefits                 311.1 (97.4) (277.1)
Other comprehensive income (loss), net of tax                 319.6 (85.9) (270.7)
Comprehensive income (loss)                 481.2 81.9 (47.6)
Less: Comprehensive income attributable to noncontrolling interest                 0 0 0
Comprehensive income (loss) attributable to ATI                 481.2 81.9 (47.6)
Subsidiary [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 (46.3) 41.5 108.2
Currency translation adjustment arising during the period                 0 0 0
Unrealized holding gain (loss) on securities                 0   0
Net derivative gain (loss) on hedge transactions                 0 0 0
Pension and postretirement benefits                 22.0 (18.1) (32.9)
Other comprehensive income (loss), net of tax                 22.0 (18.1) (32.9)
Comprehensive income (loss)                 (24.3) 23.4 75.3
Less: Comprehensive income attributable to noncontrolling interest                 0 0 0
Comprehensive income (loss) attributable to ATI                 (24.3) 23.4 75.3
Non-Guarantor Subsidiaries [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 387.9 274.7 291.0
Currency translation adjustment arising during the period                 15.3 14.3 2.7
Unrealized holding gain (loss) on securities                 0.1   (0.1)
Net derivative gain (loss) on hedge transactions                 0 0 0
Pension and postretirement benefits                 27.6 (5.1) (20.9)
Other comprehensive income (loss), net of tax                 43.0 9.2 (18.3)
Comprehensive income (loss)                 430.9 283.9 272.7
Less: Comprehensive income attributable to noncontrolling interest                 11.0 11.3 14.6
Comprehensive income (loss) attributable to ATI                 419.9 272.6 258.1
Eliminations [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 (341.6) (316.2) (399.2)
Currency translation adjustment arising during the period                 (15.3) (14.3) (2.7)
Unrealized holding gain (loss) on securities                 (0.1)   0.1
Net derivative gain (loss) on hedge transactions                 0 0 0
Pension and postretirement benefits                 (49.6) 23.2 53.8
Other comprehensive income (loss), net of tax                 (65.0) 8.9 51.2
Comprehensive income (loss)                 (406.6) (307.3) (348.0)
Less: Comprehensive income attributable to noncontrolling interest                 0 0 0
Comprehensive income (loss) attributable to ATI                 $ (406.6) $ (307.3) $ (348.0)