CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net earnings (loss)	$ (6.8)	$ 5.4	$ (10.0)
Other comprehensive income (loss):
Currency translation adjustments	(6.0)
Pension benefit adjustments	7.1
Deferred tax benefit on pension benefit adjustments	(2.1)
Net change in unrealized gains during the period:
Investment securities, available for sale			0.2
Reclassification of realized amount included in net loss			(0.4)
Comprehensive income (loss)	(7.8)	5.4	(10.2)
Comprehensive income (loss) attributable to noncontrolling interest	0.1	(0.1)
Comprehensive income (loss) attributable to Real Industry, Inc.	$ (7.9)	$ 5.5	$ (10.2)