Segment Reporting (Revenues and Operating Earnings (Losses) by Reportable Segment) (Details) $ in Millions	3 Months Ended
	Apr. 30, 2016 USD ($) segment	Apr. 30, 2015 USD ($)
Reportable Segments [Abstract]
Number of reportable segments | segment	2
Revenues [Abstract]
Revenues	$ 368.2	$ 431.5
Operating Income (Loss) [Abstract]
Operating earnings	29.1	47.5
Interest expense	18.9	18.6
Earnings before income taxes	10.2	28.9
Aerospace Solutions Group
Revenues [Abstract]
Revenues	331.1	348.0
Operating Income (Loss) [Abstract]
Operating earnings	59.9	60.8
Energy Services Group
Revenues [Abstract]
Revenues	37.1	83.5
Operating Income (Loss) [Abstract]
Operating earnings	$ (30.8)	$ (13.3)