CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Foreign currency translation gains (losses)	$ (14.6)	$ 2.9	$ (5.2)	$ 18.5
Net income (loss)	58.7	66.0	117.0	124.7
Comprehensive income (loss)	70.8	77.0	145.6	153.4
Other Comprehensive Income (Loss), Net of Tax	12.1	11.0	28.6	28.7
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	10.1	(3.3)	0.4	(12.6)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0	0	0.1	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	16.6	11.4	33.3	22.8
Noncontrolling Interests [Member]
Foreign currency translation gains (losses)	(1.2)	1.6	(0.6)	3.2
Net income (loss)	2.3	2.0	4.4	4.4
Comprehensive income (loss)	1.1	3.6	3.8	7.6
Other Comprehensive Income (Loss), Net of Tax	(1.2)	1.6	(0.6)	3.2
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	0	0	0	0
ATI [member]
Foreign currency translation gains (losses)	(13.4)	1.3	(4.6)	15.3
Net income (loss)	56.4	64.0	112.6	120.3
Comprehensive income (loss)	69.7	73.4	141.8	145.8
Other Comprehensive Income (Loss), Net of Tax	13.3	9.4	29.2	25.5
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	10.1	(3.3)	0.4	(12.6)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0	0	0.1	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$ 16.6	$ 11.4	$ 33.3	$ 22.8