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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Sales	$ 1,020.2	$ 869.1	$ 3,008.7	$ 2,615.2
Cost of sales	859.8	763.8	2,526.0	2,260.8
Gross profit (loss)	160.4	105.3	482.7	354.4
Selling and administrative expenses	65.5	64.6	195.3	187.5
Impairment of goodwill	0.0	114.4	0.0	114.4
Operating income (loss)	94.9	(73.7)	287.4	52.5
Nonoperating retirement benefit expense	(8.4)	(13.6)	(25.5)	(40.9)
Interest income (expense), net	(24.8)	(34.2)	(75.8)	(102.2)
Other income (loss) including equity in income of unconsolidated subsidiaries	0.8	0.2	22.4	3.7
Income (loss) before income tax provision (benefit)	62.5	(121.3)	208.5	(86.9)
Income tax provision (benefit)	6.9	(1.9)	16.8	(2.0)
Net income (loss)	55.6	(119.4)	191.7	(84.9)
Less: Net income attributable to noncontrolling interests	5.1	1.8	10.4	8.7
Net income (loss) attributable to ATI	50.5	(121.2)	181.3	(93.6)
Comprehensive income (loss) attributable to ATI	50.8	(70.3)	217.8	(16.2)
Reportable Legal Entities | Parent Company
Income Statement [Abstract]
Sales	0.0	0.0	0.0	0.0
Cost of sales	3.7	3.4	11.7	12.5
Gross profit (loss)	(3.7)	(3.4)	(11.7)	(12.5)
Selling and administrative expenses	24.9	24.8	73.0	66.8
Impairment of goodwill		0.0		0.0
Operating income (loss)	(28.6)	(28.2)	(84.7)	(79.3)
Nonoperating retirement benefit expense	(3.1)	(8.0)	(9.7)	(24.2)
Interest income (expense), net	(34.9)	(40.1)	(102.1)	(118.4)
Other income (loss) including equity in income of unconsolidated subsidiaries	129.1	(45.0)	405.0	135.0
Income (loss) before income tax provision (benefit)	62.5	(121.3)	208.5	(86.9)
Income tax provision (benefit)	6.9	(1.9)	16.8	(2.0)
Net income (loss)	55.6	(119.4)	191.7	(84.9)
Less: Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to ATI	55.6	(119.4)	191.7	(84.9)
Comprehensive income (loss) attributable to ATI	46.9	(63.5)	223.0	(0.3)
Reportable Legal Entities | Subsidiary
Income Statement [Abstract]
Sales	357.4	287.9	1,047.0	866.3
Cost of sales	316.3	279.3	962.8	809.0
Gross profit (loss)	41.1	8.6	84.2	57.3
Selling and administrative expenses	7.3	8.4	25.2	26.5
Impairment of goodwill		0.0		0.0
Operating income (loss)	33.8	0.2	59.0	30.8
Nonoperating retirement benefit expense	(4.9)	(4.7)	(14.6)	(14.0)
Interest income (expense), net	(29.5)	(22.9)	(83.3)	(66.6)
Other income (loss) including equity in income of unconsolidated subsidiaries	0.4	0.3	19.5	1.1
Income (loss) before income tax provision (benefit)	(0.2)	(27.1)	(19.4)	(48.7)
Income tax provision (benefit)	1.4	(8.6)	(2.9)	(16.3)
Net income (loss)	(1.6)	(18.5)	(16.5)	(32.4)
Less: Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to ATI	(1.6)	(18.5)	(16.5)	(32.4)
Comprehensive income (loss) attributable to ATI	0.9	(15.5)	(9.3)	(27.1)
Reportable Legal Entities | NonGuarantor Subsidiaries
Income Statement [Abstract]
Sales	662.8	581.2	1,961.7	1,748.9
Cost of sales	539.8	481.1	1,551.5	1,439.3
Gross profit (loss)	123.0	100.1	410.2	309.6
Selling and administrative expenses	33.3	31.4	97.1	94.2
Impairment of goodwill		114.4		114.4
Operating income (loss)	89.7	(45.7)	313.1	101.0
Nonoperating retirement benefit expense	(0.4)	(0.9)	(1.2)	(2.7)
Interest income (expense), net	39.6	28.8	109.6	82.8
Other income (loss) including equity in income of unconsolidated subsidiaries	(0.1)	(0.1)	0.6	2.6
Income (loss) before income tax provision (benefit)	128.8	(17.9)	422.1	183.7
Income tax provision (benefit)	21.2	28.3	66.3	97.4
Net income (loss)	107.6	(46.2)	355.8	86.3
Less: Net income attributable to noncontrolling interests	5.1	1.8	10.4	8.7
Net income (loss) attributable to ATI	102.5	(48.0)	345.4	77.6
Comprehensive income (loss) attributable to ATI	97.9	(28.5)	334.7	109.9
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
Operating income (loss)	0.0	0.0	0.0	0.0
Nonoperating retirement benefit expense	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	(128.6)	45.0	(402.7)	(135.0)
Income (loss) before income tax provision (benefit)	(128.6)	45.0	(402.7)	(135.0)
Income tax provision (benefit)	(22.6)	(19.7)	(63.4)	(81.1)
Net income (loss)	(106.0)	64.7	(339.3)	(53.9)
Less: Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to ATI	(106.0)	64.7	(339.3)	(53.9)
Comprehensive income (loss) attributable to ATI	$ (94.9)	$ 37.2	$ (330.6)	$ (98.7)

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