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Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Risk Management Assets Current    
Derivatives, Fair Value [Line Items]    
Risk management assets [1] $ 13.7 $ 0.6
Risk Management Assets Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets [2] 6.7 3.8
Risk Management Liabilities Current    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 96.9 12.6
Risk Management Liabilities Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 169.5 134.0
Interest Rate Risk | Risk Management Assets Current    
Derivatives, Fair Value [Line Items]    
Risk management assets [1] 0.0 0.0
Interest Rate Risk | Risk Management Assets Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets [2] 0.0 0.0
Interest Rate Risk | Risk Management Liabilities Current    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 92.1 0.0
Interest Rate Risk | Risk Management Liabilities Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 123.3 76.2
Commodity Price Risk Programs | Risk Management Assets Current    
Derivatives, Fair Value [Line Items]    
Risk management assets [1] 13.7 0.6
Commodity Price Risk Programs | Risk Management Assets Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets [2] 6.7 3.8
Commodity Price Risk Programs | Risk Management Liabilities Current    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 4.8 12.6
Commodity Price Risk Programs | Risk Management Liabilities Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities $ 46.2 $ 57.8
[1] Presented in "Prepayments and other" on the Condensed Consolidated Balance Sheets (unaudited).
[2] Presented in "Deferred charges and other" on the Condensed Consolidated Balance Sheets (unaudited).