Quarterly report pursuant to Section 13 or 15(d)

Investments in Affiliates and Other Entities (Details)

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Investments in Affiliates and Other Entities (Details)
mile in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2022
USD ($)
Jun. 30, 2020
mile
Dec. 31, 2021
USD ($)
Oct. 31, 2021
Mar. 31, 2021
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Equity method investments $ 123.3   $ 101.2    
Length of electric transmission and distribution system | mile   18      
Investment balance 28.1   130.2    
Equity security fair value 83.1        
Decrease in fair value (8.4)        
Investment in real estate 23.2       $ 23.5
LUMA Energy, LLC          
Summary Of Significant Accounting Policies [Line Items]          
Term of operation and maintenance agreement   15 years      
Integral Affiliates          
Summary Of Significant Accounting Policies [Line Items]          
Due from related parties 54.9        
Due to related parties 62.0        
Revenue from related parties 25.1        
Related party cost of sales 50.4        
Integral Unconsolidated Affiliates          
Summary Of Significant Accounting Policies [Line Items]          
Equity method investments 33.7        
Equity interest       44.00%  
LUMA Energy, LLC          
Summary Of Significant Accounting Policies [Line Items]          
Equity method investments $ 39.9   $ 30.6    
Equity interest 50.00%        
Broadband Technology Provider          
Summary Of Significant Accounting Policies [Line Items]          
Cost method investments         $ 90.0
Technology Incubation Company          
Summary Of Significant Accounting Policies [Line Items]          
Cost method investments, gain on sale $ 6.7        
Cost method investments, gain on sale, after tax 5.0        
Starry Group Holdings, Inc.          
Summary Of Significant Accounting Policies [Line Items]          
Payments to acquire equity securities $ 1.5