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Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Risk Management Assets Current    
Derivatives, Fair Value [Line Items]    
Risk management assets [1] $ 17.3 $ 0.6
Risk Management Assets Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets [2] 10.9 3.8
Risk Management Liabilities Current    
Derivatives, Fair Value [Line Items]    
Risk management liabilities [3] 14.5 12.6
Risk Management Liabilities Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 312.1 134.0
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 [3] 0.0 0.0
Interest Rate Risk | Risk Management Liabilities Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities 253.7 76.2
Commodity Price Risk Programs | Risk Management Assets Current    
Derivatives, Fair Value [Line Items]    
Risk management assets [1] 17.3 0.6
Commodity Price Risk Programs | Risk Management Assets Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management assets [2] 10.9 3.8
Commodity Price Risk Programs | Risk Management Liabilities Current    
Derivatives, Fair Value [Line Items]    
Risk management liabilities [3] 14.5 12.6
Commodity Price Risk Programs | Risk Management Liabilities Noncurrent    
Derivatives, Fair Value [Line Items]    
Risk management liabilities $ 58.4 $ 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).
[3] Presented in "Other accruals" on the Condensed Consolidated Balance Sheets (unaudited).