Goodwill and Long-Lived Assets, Net (Goodwill and Amortization Expenses) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended								12 Months Ended
	Jan. 31, 2015	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2017	Jan. 31, 2016	Dec. 31, 2014	Dec. 31, 2013
Amortization expense of intangible assets	$ 2.8										$ 19.6	$ 23.7	$ 30.5
Expected amortization expenses in year one		$ 19.0								$ 19.0
Expected amortization expenses in year two		19.0								19.0
Expected amortization expenses in year three		19.0								19.0
Expected amortization expenses in year four		19.0								19.0
Expected amortization expenses in year five		19.0								19.0
Goodwill	1,286.5	996.4				$ 954.9				996.4	954.9	1,328.7
Revenues	133.0	373.4	$ 389.0	$ 378.9	$ 352.8	358.2	$ 365.0	$ 412.7	$ 431.5	1,494.1	1,567.4	1,695.7
Long-lived assets impairment	0.0									0.0		0.0
Intangible assets impairment							177.8				177.8
Property and equipment impairment							$ 152.0
Accumulated goodwill impairment loss						601.1					601.1
Herndon
Goodwill		50.8								50.8
Aerospace Solutions Group
Goodwill	965.8	$ 996.4				$ 952.4				996.4	952.4	986.3
Revenues	$ 93.1									$ 1,340.9	$ 1,312.5	$ 1,310.2