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Equity Investments Equity Investment in Nobles 2 (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
MW
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Equity Investments [Line Items]      
Equity Investments $ 318.0 $ 301.2  
Cash Investments 17.6 99.1 $ 37.9
Equity Earnings 20.0 22.1 21.7
Net Loss Attributable to Non-Controlling Interest (31.4) (12.6) (0.1)
Nobles 2 [Member]      
Equity Investments [Line Items]      
Net Loss Attributable to Non-Controlling Interest $ 6.6    
Nobles 2 [Member]      
Equity Investments [Line Items]      
Equity Method Investment, Ownership Percentage 49.00%    
Equity Investments $ 163.5 152.2  
Cash Investments 17.6    
Equity Earnings [1] (1.3)    
Distributed Earnings $ (5.0)    
ATC [Member]      
Equity Investments [Line Items]      
Equity Method Investment, Ownership Percentage 8.00%    
Equity Investments $ 154.5 149.0 $ 141.6
Cash Investments 0.0 2.7  
Expected Additional Investment in 2022 6.0    
Equity Earnings 21.3 22.3  
Distributed Earnings $ (17.2) $ (18.9)  
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 $6.6 million related to its investment in Nobles 2