Litigation (Details) (WesternGeco [Member], USD $) In Millions, unless otherwise specified	1 Months Ended						1 Months Ended		1 Months Ended		0 Months Ended	1 Months Ended	0 Months Ended
	Mar. 31, 2011 mi	Jun. 30, 2009 Patent	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Aug. 16, 2012 Pending Litigation [Member]	Mar. 31, 2014 Pending Litigation, Post Appeal [Member]	Aug. 16, 2012 Lost Royalties [Member] Pending Litigation [Member]	Aug. 16, 2012 Lost Profits [Member] Pending Litigation [Member]	Oct. 24, 2013 Lost Profits [Member] Settled Litigation [Member]	Apr. 30, 2014 Subsequent Event [Member] Lost Profits [Member] Settled Litigation [Member]	Oct. 24, 2013 Previously Reported [Member] Lost Profits [Member] Settled Litigation [Member]	Oct. 24, 2013 Scenario, Adjustment [Member] Lost Profits [Member] Settled Litigation [Member]
Litigation (Textual) [Abstract]
Number of patent apparatus claims contained		4
Minimum distance from coast to make alleged activities not actionable under patent infringement law	12
Total damages awarded							$ 105.9		$ 12.5	$ 93.4	$ 9.4		$ 73.1	$ (70.0)
Reduction in damages award in the case												(3.0)
Accrual for loss contingency related to legal proceedings			123.8	193.3	120.0	10.0
Maximum amount of appeal bond								$ 120.0