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Business Combinations (Details)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2012
Electropar [Member]
USD ($)
Dec. 31, 2011
Electropar [Member]
USD ($)
Jul. 31, 2011
Electropar [Member]
USD ($)
Jul. 31, 2011
Electropar [Member]
NZD
Jul. 31, 2010
Electropar [Member]
USD ($)
Jul. 31, 2010
Electropar [Member]
NZD
Dec. 31, 2012
Australian Electricity [Member]
AUD
Jan. 31, 2012
Australian Electricity [Member]
AUD
Business Acquisition [Line Items]                    
Acquisition of outstanding equity   $ 8.9         $ 14.8 20.3   6.3
Business combination working capital adjustment     0.2           0.5  
Additional earn-out consideration payment as of purchase price         1.5 2.0       1.1
Accrued liability additional earn-out consideration accrued         0.4       0.4  
Amount accrued in the consolidated balance sheet       1.1            
Accrued liability additional earn-out consideration increased       0.6            
Adjustment for actual results       0.6            
Changes in Net present value of liability       0.1            
Cost of Acquisition of subsidiaries and other assets                   1.8
Business Combination (Textual) [Abstract]                    
Cost of Acquisition of subsidiaries and other assets $ 0.6