Litigation (Details) (WesternGeco [Member], USD $) In Millions, unless otherwise specified	1 Months Ended		9 Months Ended	1 Months Ended		0 Months Ended	1 Months Ended		1 Months Ended
	Jun. 30, 2009 Patent	Aug. 31, 2012 Pending Litigation [Member]	Sep. 30, 2014 Pending Litigation, Post Appeal [Member]	Aug. 31, 2012 Lost Royalties [Member] Pending Litigation [Member]	Aug. 31, 2012 Lost Profits [Member] Pending Litigation [Member]	Oct. 24, 2013 Lost Profits [Member] Settled Litigation [Member]	Apr. 30, 2014 Lost Profits [Member] Settled Litigation [Member]	May 31, 2014 Lost Profits [Member] Settled Litigation [Member]	Oct. 31, 2013 Previously Reported [Member] Lost Profits [Member] Settled Litigation [Member]
Litigation (Textual) [Abstract]
Number of patent apparatus claims contained	4
Total damages awarded		$ 105.9		$ 12.5	$ 93.4	$ 9.4			$ 73.1
Reduction in damages award in the case							(3.0)
Accrual for loss contingency related to legal proceedings								123.8
Maximum amount of appeal bond			120.0
Annual fee to maintain appeal bond			$ 2.0