CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income (loss)	$ 4.4	$ (290.8)
Other comprehensive income (loss), before tax:
Foreign currency translation gain (loss)	1.5	(3.2)
Cash flow hedges:
Gains (losses) arising in period	(7.8)	(18.0)
Reclassification of losses (gains) to net income (loss)	13.2	17.9
Pension and OPEB plans:
Reclassification of prior service cost (credits) included in net income (loss)	(13.8)	(15.1)
Reclassification of losses (gains) included in net income (loss)	5.9	8.2
Other comprehensive income (loss), before tax	(1.0)	(10.2)
Income tax expense related to items of comprehensive income (loss)	0.0	0.0
Other comprehensive income (loss)	(1.0)	(10.2)
Comprehensive income (loss)	3.4	(301.0)
Less: Comprehensive income attributable to noncontrolling interests	18.0	15.5
Comprehensive income (loss) attributable to AK Steel Holding Corporation	$ (14.6)	$ (316.5)