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Commitments and Contingencies Commitments and Contingencies Narrative (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2010	Dec. 31, 2011	Dec. 31, 2011 Vendor Supplied Component Warranty Expense Type [Member]	Dec. 31, 2010 Arbitration claims in Sweden [Member]	Dec. 31, 2011 Corrective actions for specific customers warranty charge type [Member]	Dec. 31, 2011 A specific batch of C&I meters that were manufactured with a misaligned automated solder-feeder [Member]
Reduction in YTD Q3 2010 revenue due to restatement	$ 6.1
Impact of Restatement on Earnings Per Share, Diluted	$ 0.11
Recovery Associated With Settlement Of Product Claims		8.6
Warranty charge			$ 12.6	$ 14.4	$ 4.7	$ 6.6

Expressed in per-share terms, the dollar amount of the impact of a restatement of the results of operations of a prior period on the Diluted Earnings Per Share data given for the prior period or periods.

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- Definition

Resulting effect of restatement to correct an error, before tax effects, on the net income of prior periods for the year in which any adjustments are first made. In statements containing more than one period, discloses the effects for each period.

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