Segment Information - Summarized Balance Sheet Information of Reportable Segments and Consolidated (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Assets	$ 628.8		$ 645.5
Cash and cash equivalents	12.8		27.2	$ 34.6
Other unallocated assets	1.6		5.9
LIABILITIES
Liabilities	619.9		586.1
Long-term debt, including amounts due within one year	392.7		356.5
Common stock warrant liability	1.2	$ 2.1	4.4	$ 4.2	$ 6.1	$ 6.9
Deferred income taxes, net	2.6		2.5
Other unallocated liabilities	3.5		3.8
Operating Segments | RANA
ASSETS
Assets	405.3		431.8
Cash and cash equivalents	3.5		11.5
LIABILITIES
Liabilities	110.8		119.9
Operating Segments | RAEU
ASSETS
Assets	217.5		197.9
Cash and cash equivalents	4.8		5.7
LIABILITIES
Liabilities	109.1		99.0
Corporate and Other
ASSETS
Cash and cash equivalents	$ 4.5		$ 9.9