Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Millions	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Jun. 02, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 69.1	$ 65.1	$ 85.4	$ 106.4	$ 191.9
Cost of sales	39.6	37.7	52.6	61.2	109.7
Selling, general and administrative	17.7	12.6	22.5	23.8	37.8
Transaction costs	0.0	1.0	0.3	7.4	1.2
Depreciation and amortization	10.3	10.7	13.3	17.7	32.3
Other operating expense, net	0.5	1.2	0.8	2.2	2.7
(Loss) income from operations	1.0	1.9	(4.1)	(5.9)	8.2
Interest expense	9.5	8.0	17.5	20.2	22.9
Foreign currency gain	(3.2)	(0.9)	(4.1)	(2.2)	(4.2)
(Loss) income before income taxes	(5.3)	(5.2)	(17.5)	(23.9)	(10.5)
Income tax benefit	(3.7)	(5.5)	(5.5)	(4.9)	(5.9)
Net (loss) income	(1.6)	0.3	(12.0)	(19.0)	(4.6)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(11.1)	(1.1)	(6.3)	23.6	(5.4)
Comprehensive (loss) income	$ (12.7)	$ (0.8)	$ (18.3)	$ 4.6	$ (10.0)
Net (loss) income per share—basic and diluted
Net (loss) income per share (in usd per share)	$ (0.03)	$ 279.43	$ (0.22)	$ (19,195.40)	$ (4,660.08)
Weighted-average shares outstanding (in shares)	53,871,068	995	53,870,568	995	995