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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Revenue from Contract with Customer, Excluding Assessed Tax $ 170.5 $ 208.3  
Alternative Revenue Programs Accounts Receivable, Gross 0.0   $ 0.0
RTO Revenue 10.8 10.9  
RTO Capacity Revenue 2.2 3.7  
Revenues 174.7 209.0  
Contract with Customer, Asset, Gross 60.3   65.7
Corporate, Non-Segment [Member]      
RTO Revenue 0.1 0.0  
RTO Capacity Revenue 1.0 1.6  
Revenues 6.8 8.7  
Adjustments and Eliminations [Member]      
RTO Revenue 0.0 0.0  
RTO Capacity Revenue 0.0 0.0  
Revenues (1.1) (1.1)  
Utility [Member]      
RTO Revenue 10.7 10.9  
RTO Capacity Revenue 1.2 2.1  
Revenues 169.0 201.4  
Subsidiaries [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 164.8 200.7  
Alternative Revenue Programs Accounts Receivable, Gross 0.0   0.0
RTO Revenue 10.7 10.9  
RTO Capacity Revenue 1.2 2.1  
Revenues 169.0 201.4  
Contract with Customer, Asset, Gross 59.1   $ 64.4
Other Revenues [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 2.4 2.9  
Other non-606 revenue 0.9 0.0  
Other Revenues [Member] | Corporate, Non-Segment [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 2.4 2.9  
Other non-606 revenue 0.8 0.8  
Other Revenues [Member] | Adjustments and Eliminations [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0  
Other non-606 revenue (0.8) (0.8)  
Other Revenues [Member] | Utility [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0  
Other non-606 revenue 0.9 0.0  
Other Revenues [Member] | Subsidiaries [Member]      
Other non-606 revenue 0.9 0.0  
Wholesale Revenue [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 4.9 8.4  
Wholesale Revenue [Member] | Corporate, Non-Segment [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 2.5 3.4  
Wholesale Revenue [Member] | Adjustments and Eliminations [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax (0.3) 0.0  
Wholesale Revenue [Member] | Utility [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 2.7 5.0  
Wholesale Revenue [Member] | Subsidiaries [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 2.7 5.0  
Retail Revenue [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 150.2 182.4  
Other non-606 revenue 3.3 0.7  
Retail Revenue [Member] | Corporate, Non-Segment [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0  
Other non-606 revenue 0.0 0.0  
Retail Revenue [Member] | Adjustments and Eliminations [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 (0.3)  
Other non-606 revenue 0.0 0.0  
Retail Revenue [Member] | Utility [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 150.2 182.7  
Other non-606 revenue 3.3 0.7  
Retail Revenue [Member] | Subsidiaries [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax 150.2 182.7  
Other non-606 revenue $ 3.3 $ 0.7