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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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