CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net sales	$ 1,658.9	$ 1,533.4
Cost of products sold (exclusive of item shown separately below)	1,463.7	1,276.9
Selling and administrative expenses (exclusive of item shown separately below)	76.7	71.7
Depreciation	54.9	55.1
Total operating costs	1,595.3	1,403.7
Operating profit	63.6	129.7
Interest expense	37.6	39.4
Pension and OPEB (income) expense	(10.0)	(18.1)
Other (income) expense	(3.9)	7.8
Income before income taxes	39.9	100.6
Income tax expense (benefit)	(4.9)	0.0
Net income	44.8	100.6
Less: Net income attributable to noncontrolling interests	16.1	16.2
Net income attributable to AK Steel Holding Corporation	$ 28.7	$ 84.4
Net income per share attributable to AK Steel Holding Corporation common stockholders:
Basic	$ 0.09	$ 0.27
Diluted	$ 0.09	$ 0.26