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Equity Investments Equity Investment in Nobles 2 (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
MW
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Equity Investments [Line Items]      
Equity Investments $ 322.7 $ 318.0  
Cash Investments 5.9 17.6 $ 99.1
Equity Earnings 18.7 20.0 22.1
Net Loss Attributable to Non-Controlling Interest (58.0) (31.4) (12.6)
Nobles 2 [Member]      
Equity Investments [Line Items]      
Net Loss Attributable to Non-Controlling Interest $ 10.6    
Nobles 2 [Member]      
Equity Investments [Line Items]      
Equity Method Investment, Ownership Percentage 49.00%    
Equity Investments $ 157.3 163.5  
Equity Earnings [1] (0.6)    
Distributed Earnings $ (5.6)    
ATC [Member]      
Equity Investments [Line Items]      
Equity Method Investment, Ownership Percentage 8.00%    
Equity Investments $ 165.4 154.5 149.0
Cash Investments 5.9 0.0  
Expected Additional Investment in 2022 8.2    
Equity Earnings 19.3 21.3 $ 22.3
Distributed Earnings $ (15.5) $ (17.2)  
Wind Turbine Generators [Member] | Tenaska [Member] | Minnesota Power [Member] | Nobles 2 PPA [Member]      
Equity Investments [Line Items]      
Contract Term (Years) 20 years    
Generating Capacity Counterparty Owned (MW) | MW 250    
[1] The Company also recorded net loss attributable to non-controlling interest of $10.6 million related to its investment in Nobles 2