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Commitments and Contingencies (Details 2) (USD $)
In Millions, unless otherwise specified
 1 Months Ended
Jun. 30, 2014
Sep. 30, 2013
Vehicular traffic accident
Sep. 30, 2013
L.E. Myers Co
Vehicular traffic accident
Jan. 31, 2013
L.E. Myers Co
Northern States Power Company (Wisconsin) v. The City of Ashland, Wisconsin
Minimum
Jan. 31, 2013
L.E. Myers Co
Northern States Power Company (Wisconsin) v. The City of Ashland, Wisconsin
Maximum
Jun. 30, 2014
Performance and Payment Bonds
Commitments and Contingencies            
Deductible per claim for each line of coverage, excluding health $ 1.0          
Deductible under health insurance benefits for qualified individuals 0.1          
Aggregate original face amount of outstanding bonds issued by the surety           937.8
Estimated remaining cost to complete bonded projects           171.5
Compensatory damages     0.7      
Punitive damages     3.6      
Reserve for legal settlements   2.3        
Period during which the defendant operated a manufactured gas plant       6 years 12 years  
Damages alleged         $ 140