CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net sales	$ 1,369.8	$ 1,508.7
Cost of products sold (exclusive of items shown separately below)	1,252.3	1,409.0
Selling and administrative expenses (exclusive of items shown separately below)	51.6	55.8
Depreciation	48.6	48.3
Pension and OPEB expense (income)	(15.9)	(8.5)
Total operating costs	1,336.6	1,504.6
Operating profit	33.2	4.1
Interest expense	31.0	16.2
Other income (expense)	1.8	0.9
Income (loss) before income taxes	4.0	(11.2)
Income tax provision (benefit)	(2.8)	(4.3)
Net income (loss)	6.8	(6.9)
Less: Net income attributable to noncontrolling interests	16.7	4.9
Net income (loss) attributable to AK Steel Holding Corporation	$ (9.9)	$ (11.8)
Basic and diluted earnings per share:
Net income (loss) attributable to AK Steel Holding Corporation common stockholders (in dollars per share)	$ (0.07)	$ (0.11)
Dividends declared and paid per share (in dollars per share)	$ 0.00	$ 0.05