Acquisitions and Dispositions (Details 1) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Optima Solutions [Member] USD ($)	Mar. 31, 2012 Optima Solutions [Member] GBP (£)	Apr. 30, 2012 Eastern Reservoir Services [Member] USD ($)
Business Acquisitions [Line Items]
Percentage of outstanding common stock acquired	100.00%
Purchase price		£ 41.2	$ 42.5
Purchase price (USD equivalent)	64.6
Contingent consideration, maximum possible payment		4
Purchase price allocation, net working capital	3
Purchase price allocation, property, plant, and equipment	19.6
Purchase price allocation, intangible assets	22.8
Purchase price allocation, deferred tax liabilities	7.4
Purchase price allocation, other liabilities	3.5
Purchase price allocation, nondeductible goodwill	31.3
Revenues from acquired entitiy	1.5
Depreciation and amortization from acquired entity	0.4
Pretax earnings from acquired entity	0.5
Transaction costs associated with acquisition	$ 1.3