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Goodwill (Details 3) (Strata Control Services Inc [Member], USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Strata Control Services Inc [Member]
Financial position of operating results
Net sales	$ 793.5	$ 790.1	$ 692.8
Net income	$ 73.4	$ 51.9	$ 73.2
Earnings per share basic	$ 3.16	$ 2.19	$ 3.07
Earnings per share diluted	$ 3.07	$ 2.11	$ 2.94

X

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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