UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (1.2)	$ (10.8)	$ (11.2)	$ (4.3)
Other comprehensive loss:
Currency translation adjustments	(1.4)	(1.2)	1.3	(0.9)
Amortization of net actuarial gains, net of tax			(0.1)
Comprehensive loss	(2.6)	(12.0)	(10.0)	(5.2)
Comprehensive income attributable to noncontrolling interest	0.3	0.1	0.4	0.2
Comprehensive loss attributable to Real Industry, Inc.	$ (2.9)	$ (12.1)	$ (10.4)	$ (5.4)