Summarized Balance Sheet Information of Reportable Segments and Consolidated (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Total assets	$ 763.2	$ 121.9
LIABILITIES
Total liabilities	597.2	$ 36.3
RANA
ASSETS
Total assets	389.8
LIABILITIES
Total liabilities	112.6
RAEU
ASSETS
Total assets	233.8
LIABILITIES
Total liabilities	116.4
Operating Segments | RANA
ASSETS
Total assets	389.8
LIABILITIES
Total liabilities	112.6
Operating Segments | RAEU
ASSETS
Total assets	233.8
LIABILITIES
Total liabilities	116.4
Unallocated
ASSETS
Total assets	139.6
LIABILITIES
Total liabilities	$ 368.2