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Commitments and Contingencies (Details Textual) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Performance and Payment Bonds [Member]
Sep. 30, 2013
Vehicular Traffic Accident Case [Member]
Sep. 30, 2014
Vehicular Traffic Accident Case [Member]
LE Myers Co [Member]
Jan. 31, 2013
Maximum [Member]
Northern States Power Company Wisconsin Vs The City of Ashland Wisconsin [Member]
LE Myers Co [Member]
Jan. 31, 2013
Minimum [Member]
Northern States Power Company Wisconsin Vs The City of Ashland Wisconsin [Member]
LE Myers Co [Member]
Loss Contingencies [Line Items]            
Loss Contingency Insurance Policy Deductible for Each Line of Coverage Excluding Health $ 1.0          
Loss Contingency Health Insurance Deductible For Qualified Individuals 0.1          
Outstanding Performance Bonds   978.7        
Estimated Cost to Complete Bonded Projects   144.8        
Loss Contingency Compensatory Damages Awarded Value       0.7    
Loss Contingency Punitive Damages Awarded Value       3.6    
Reserve for Legal Settlements     2.3      
Period During Which Defendant Operated Manufactured Gas Plant         12 years 6 years
Damages alleged         $ 140