CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income (loss)	$ 33.9	$ (49.5)	$ 38.3	$ (340.3)
Other comprehensive income (loss), before tax:
Foreign currency translation gain (loss)	(1.1)	1.2	0.4	(2.0)
Cash flow hedges:
Gains (losses) arising in period	40.7	(1.5)	32.9	(19.5)
Reclassification of losses (gains) to net income (loss)	14.5	9.3	27.7	27.2
Pension and OPEB plans:
Reclassification of prior service cost (credits) included in net income (loss)	(13.8)	(15.0)	(27.6)	(30.1)
Reclassification of losses (gains) included in net income (loss)	6.0	8.2	11.9	16.4
Other comprehensive income (loss), before tax	46.3	2.2	45.3	(8.0)
Income tax expense related to items of comprehensive income (loss)	3.9	0.0	3.9	0.0
Other comprehensive income (loss)	42.4	2.2	41.4	(8.0)
Comprehensive income (loss)	76.3	(47.3)	79.7	(348.3)
Less: Comprehensive income attributable to noncontrolling interests	16.6	14.5	34.6	30.0
Comprehensive income (loss) attributable to AK Steel Holding Corporation	$ 59.7	$ (61.8)	$ 45.1	$ (378.3)