Segment and Geographic Information - Summarized Balance Sheet Information of Reportable Segments and Consolidated (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Assets	$ 592.1	$ 645.5
Cash and cash equivalents	24.9	27.2	$ 35.7
Deferred income taxes, net	9.0
Other unallocated assets	3.3	5.9
LIABILITIES
Liabilities	644.5	586.1
RA DIP Financing, net	103.9
Long-term debt, net	8.0	356.5
Common stock warrant liability		4.4	$ 6.9	$ 5.6
Deferred income taxes, net	2.7	2.5
Other unallocated liabilities	3.8	3.8
Operating Segments | RANA
ASSETS
Assets	373.4	431.8
Cash and cash equivalents	14.4	11.5
LIABILITIES
Liabilities	429.0	119.9
Operating Segments | RAEU
ASSETS
Assets	204.4	197.9
Cash and cash equivalents	8.5	5.7
LIABILITIES
Liabilities	97.1	99.0
Corporate and Other
ASSETS
Cash and cash equivalents	$ 2.0	$ 9.9