UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenues	$ 332.8	$ 314.9	$ 1,020.1	$ 945.2
Cost of sales	320.5	298.3	976.3	889.7
Gross profit	12.3	16.6	43.8	55.5
Selling, general and administrative expenses	12.4	18.1	39.2	48.1
Losses on derivative financial instruments, net		0.8	1.7	0.5
Amortization of identifiable intangible assets	0.6	0.5	1.8	1.8
Goodwill impairment	33.6		33.6
Other operating expense, net	0.5	0.7	2.1	2.6
Operating profit (loss)	(34.8)	(3.5)	(34.6)	2.5
Nonoperating expense (income):
Interest expense, net	9.8	9.2	30.4	27.5
Change in fair value of common stock warrant liability	(0.9)	(1.9)	(3.2)	(2.6)
Income from equity method investment	(2.3)		(2.9)
Foreign exchange gains on intercompany loans	(1.1)		(3.3)	(1.0)
Other, net	0.2	0.5	0.5	0.3
Total nonoperating expense, net	5.7	7.8	21.5	24.2
Loss from continuing operations before income taxes	(40.5)	(11.3)	(56.1)	(21.7)
Income tax expense (benefit)	0.0	(0.5)	1.9	0.4
Loss from continuing operations	(40.5)	(10.8)	(58.0)	(22.1)
Earnings from discontinued operations, net of income taxes				0.1
Net loss	(40.5)	(10.8)	(58.0)	(22.0)
Earnings from continuing operations attributable to noncontrolling interest	0.3	0.1	0.7	0.5
Net loss attributable to Real Industry, Inc.	(40.8)	(10.9)	(58.7)	(22.5)
LOSS PER SHARE
Net loss attributable to Real Industry, Inc.	(40.8)	(10.9)	(58.7)	(22.5)
Dividends on Redeemable Preferred Stock, in-kind		(0.5)		(1.4)
Dividends on Redeemable Preferred Stock, in cash or accrued	(0.6)		(1.7)
Accretion of fair value adjustment to Redeemable Preferred Stock	(0.2)	(0.2)	(0.7)	(0.8)
Accretion of fair value adjustment to Redeemable Preferred Stock			(0.7)
Net loss available to common stockholders	$ (41.6)	$ (11.6)	$ (61.1)	$ (24.7)
Basic and diluted loss per share:
Continuing operations	$ (1.43)	$ (0.40)	$ (2.11)	$ (0.85)
Basic and diluted loss per share	$ (1.43)	$ (0.40)	$ (2.11)	$ (0.85)