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Financial Information for Subsidiary and Guarantor Parent (I.S.) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Sales	$ 869.1	$ 770.5	$ 2,615.2	$ 2,338.5
Cost of sales	775.8	720.3	2,296.8	2,273.3
Gross profit (loss)	93.3	50.2	318.4	65.2
Selling and administrative expenses	66.2	60.5	192.4	182.4
Impairment of goodwill	114.4	0.0	114.4	0.0
Restructuring charges	0.0	488.6	0.0	498.6
Operating income (loss)	(87.3)	(498.9)	11.6	(615.8)
Interest income (expense), net	(34.2)	(32.6)	(102.2)	(91.2)
Other income (loss) including equity in income of unconsolidated subsidiaries	0.2	0.0	3.7	1.8
Income (loss) before income tax provision (benefit)	(121.3)	(531.5)	(86.9)	(705.2)
Income tax provision (benefit)	(1.9)	(4.3)	(2.0)	(64.4)
Net income (loss)	(119.4)	(527.2)	(84.9)	(640.8)
Less: Net income attributable to noncontrolling interests	1.8	3.6	8.7	10.0
Net income (loss) attributable to ATI	(121.2)	(530.8)	(93.6)	(650.8)
Comprehensive income (loss) attributable to ATI	(70.3)	(518.8)	(16.2)	(598.0)
Reportable Legal Entities | Parent Company
Income Statement [Abstract]
Sales	0.0	0.0	0.0	0.0
Cost of sales	10.4	14.0	33.4	43.0
Gross profit (loss)	(10.4)	(14.0)	(33.4)	(43.0)
Selling and administrative expenses	25.8	23.8	70.1	66.3
Impairment of goodwill	0.0		0.0
Restructuring charges		0.0		0.0
Operating income (loss)	(36.2)	(37.8)	(103.5)	(109.3)
Interest income (expense), net	(40.1)	(36.5)	(118.4)	(101.4)
Other income (loss) including equity in income of unconsolidated subsidiaries	(45.0)	(457.2)	135.0	(494.5)
Income (loss) before income tax provision (benefit)	(121.3)	(531.5)	(86.9)	(705.2)
Income tax provision (benefit)	(1.9)	(4.3)	(2.0)	(64.4)
Net income (loss)	(119.4)	(527.2)	(84.9)	(640.8)
Less: Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to ATI	(119.4)	(527.2)	(84.9)	(640.8)
Comprehensive income (loss) attributable to ATI	(63.5)	(516.8)	(0.3)	(592.6)
Reportable Legal Entities | Subsidiary
Income Statement [Abstract]
Sales	287.9	253.0	866.3	727.7
Cost of sales	283.8	266.6	822.5	852.0
Gross profit (loss)	4.1	(13.6)	43.8	(124.3)
Selling and administrative expenses	8.6	4.2	27.0	18.8
Impairment of goodwill	0.0		0.0
Restructuring charges		0.5		9.5
Operating income (loss)	(4.5)	(18.3)	16.8	(152.6)
Interest income (expense), net	(22.9)	(19.3)	(66.6)	(51.0)
Other income (loss) including equity in income of unconsolidated subsidiaries	0.3	0.2	1.1	0.6
Income (loss) before income tax provision (benefit)	(27.1)	(37.4)	(48.7)	(203.0)
Income tax provision (benefit)	(8.6)	(9.1)	(16.3)	(70.1)
Net income (loss)	(18.5)	(28.3)	(32.4)	(132.9)
Less: Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to ATI	(18.5)	(28.3)	(32.4)	(132.9)
Comprehensive income (loss) attributable to ATI	(15.5)	(27.0)	(27.1)	(114.2)
Reportable Legal Entities | NonGuarantor Subsidiaries
Income Statement [Abstract]
Sales	581.2	517.5	1,748.9	1,610.8
Cost of sales	481.6	439.7	1,440.9	1,378.3
Gross profit (loss)	99.6	77.8	308.0	232.5
Selling and administrative expenses	31.8	32.5	95.3	97.3
Impairment of goodwill	114.4		114.4
Restructuring charges		488.1		489.1
Operating income (loss)	(46.6)	(442.8)	98.3	(353.9)
Interest income (expense), net	28.8	23.2	82.8	61.2
Other income (loss) including equity in income of unconsolidated subsidiaries	(0.1)	(0.2)	2.6	1.5
Income (loss) before income tax provision (benefit)	(17.9)	(419.8)	183.7	(291.2)
Income tax provision (benefit)	28.3	(165.8)	97.4	(116.3)
Net income (loss)	(46.2)	(254.0)	86.3	(174.9)
Less: Net income attributable to noncontrolling interests	1.8	3.6	8.7	10.0
Net income (loss) attributable to ATI	(48.0)	(257.6)	77.6	(184.9)
Comprehensive income (loss) attributable to ATI	(28.5)	(260.0)	109.9	(199.0)
Eliminations
Income Statement [Abstract]
Sales	0.0	0.0	0.0	0.0
Cost of sales	0.0	0.0	0.0	0.0
Gross profit (loss)	0.0	0.0	0.0	0.0
Selling and administrative expenses	0.0	0.0	0.0	0.0
Impairment of goodwill	0.0		0.0
Restructuring charges		0.0		0.0
Operating income (loss)	0.0	0.0	0.0	0.0
Interest income (expense), net	0.0	0.0	0.0	0.0
Other income (loss) including equity in income of unconsolidated subsidiaries	45.0	457.2	(135.0)	494.2
Income (loss) before income tax provision (benefit)	45.0	457.2	(135.0)	494.2
Income tax provision (benefit)	(19.7)	174.9	(81.1)	186.4
Net income (loss)	64.7	282.3	(53.9)	307.8
Less: Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to ATI	64.7	282.3	(53.9)	307.8
Comprehensive income (loss) attributable to ATI	$ 37.2	$ 285.0	$ (98.7)	$ 307.8

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