Goodwill and Long-lived Assets, Net (Goodwill and Amortization Expenses) (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2015	Oct. 31, 2015	Jan. 31, 2016	Dec. 31, 2014	Dec. 31, 2013
Amortization expense of intangible assets	$ 2,800,000		$ 23,700,000	$ 30,500,000	$ 19,900,000
Expected amortization expenses in year one			15,000,000
Goodwill impairment charge		$ 310,400,000	310,400,000
Intangible assets impairment		177,800,000	177,800,000
Property and equipment impairment		$ 152,000,000
Accumulated goodwill impairment loss			601,100,000
Goodwill	1,286,500,000		954,900,000	1,328,700,000	1,069,800,000
Energy Services Group
Goodwill impairment charge	0		310,400,000	0	0
Long-lived assets impairment	0		329,800,000	0	0
Intangible assets impairment			177,800,000
Property and equipment impairment			152,000,000
Goodwill	$ 320,700,000		$ 2,500,000	$ 342,400,000	$ 42,100,000