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Rate Matters, NSP-Wisconsin (Details) - NSP-Wisconsin - USD ($)
$ in Millions
 1 Months Ended
Dec. 31, 2015
May. 31, 2015
PSCW Proceeding - Electric and Gas Rate Case 2016 - Electric Rates 2016    
Rate Matters [Abstract]    
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 27.4
Public Utilities, Requested Rate Increase (Decrease), Percentage   3.90%
Public Utilities, Requested Rate Base, Amount   $ 1,200.0
Public Utilities, Percentage of Requested Non-fuel and Purchased Power Rate Increase Approved by Commission 65.00%  
Public Utilities, Requested Increase Related To Capital Investment   23.0
Public Utilities, Requested Decrease Related to ROE and Capital Structure   0.0
Public Utilities, Requested Increase Related to Generation and Transmission Expenses   37.2
Public Utilities, Requested Increase Related to Operating and Maintenance Expenses   11.1
Public Utilities, Requested Decrease Related to Sales Forecast   (27.0)
Public Utilities, Total Requested Rate Increase Excluding Fuel and Purchased Power   44.3
Public Utilities, Requested Decrease Related to Fuel and Purchased Power Expenses   (16.9)
PSCW Proceeding - Electric and Gas Rate Case 2016 - Electric Rates 2016 | Public Service Commission of Wisconsin (PSCW)    
Rate Matters [Abstract]    
Public Utilities, Approved Rate Increase (Decrease), Amount $ 7.6  
Public Utilities, Approved Rate Increase (Decrease), Percentage 1.10%  
Public utilities, Approved Increase Related To Capital Investment $ 13.9  
Public Utilities, Approved Decrease Related to ROE and Capital Structure (3.8)  
Public Utilities, Approved Rate Increase Related to Generation and Transmission Expenses 42.7  
Public Utilities, Approved Increase Related to Operating and Maintenance Expenses 3.2  
Public Utilities, Approved Decrease Related to Sales Forecast 27.0  
Public Utilities, Total Approved Rate Increase Excluding Fuel and Purchased Power 29.0  
Public Utilities, Approved Decrease Related to Fuel and Purchased Power Expenses $ 21.4  
PSCW Proceeding - Electric and Gas Rate Case 2016 - Gas Rates 2016    
Rate Matters [Abstract]    
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 5.9
Public Utilities, Requested Rate Increase (Decrease), Percentage   5.00%
Public Utilities, Requested Rate Base, Amount   $ 111.2
Public Utilities, Percentage of Requested Non-fuel and Purchased Power Rate Increase Approved by Commission 71.00%  
Public Utilities, Requested Increase Related To Capital Investment   3.7
Public Utilities, Requested Decrease Related to ROE and Capital Structure   0.0
Public Utilities, Requested Increase Related to Operating and Maintenance Expenses   3.2
Public Utilities, Requested Decrease Related to Sales Forecast   (3.9)
Public Utilities, Requested Increase Related Environmental Remediation Expenses   $ 2.9
PSCW Proceeding - Electric and Gas Rate Case 2016 - Gas Rates 2016 | Public Service Commission of Wisconsin (PSCW)    
Rate Matters [Abstract]    
Public Utilities, Approved Rate Increase (Decrease), Amount $ 4.2  
Public Utilities, Approved Rate Increase (Decrease), Percentage 3.60%  
Public utilities, Approved Increase Related To Capital Investment $ 3.7  
Public Utilities, Approved Decrease Related to ROE and Capital Structure (0.4)  
Public Utilities, Approved Increase Related to Operating and Maintenance Expenses 1.9  
Public Utilities, Approved Decrease Related to Sales Forecast 3.9  
Public Utilities, Approved Increase Related Environmental Remediation Expenses $ 2.9  
PSCW Proceeding - Electric and Gas Rate Case 2016    
Rate Matters [Abstract]    
Public Utilities, Requested Return on Equity, Percentage   10.20%
Public Utilities, Requested Equity Capital Structure, Percentage   52.50%
PSCW Proceeding - Electric and Gas Rate Case 2016 | Public Service Commission of Wisconsin (PSCW)    
Rate Matters [Abstract]    
Public Utilities, Approved Return on Equity, Percentage 10.00%  
Public Utilities, Approved Equity Capital Structure, Percentage 52.50%