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Risk Management Activities (Tables)
 6 Months Ended
Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
Risk management assets and liabilities on our derivatives are presented on the Condensed Consolidated Balance Sheets (unaudited) as shown below:
(in millions)June 30, 2021December 31, 2020
Risk Management Assets - Current(1)
Interest rate risk programs$— $— 
Commodity price risk programs7.4 10.4 
Total$7.4 $10.4 
Risk Management Assets - Noncurrent(2)
Interest rate risk programs$— $— 
Commodity price risk programs5.0 2.8 
Total$5.0 $2.8 
Risk Management Liabilities - Current(3)
Interest rate risk programs$50.6 $70.9 
Commodity price risk programs0.8 7.3 
Total$51.4 $78.2 
Risk Management Liabilities - Noncurrent(4)
Interest rate risk programs$73.4 $99.5 
Commodity price risk programs23.8 45.1 
Total$97.2 $144.6 
(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).
(4)Presented in "Other noncurrent liabilities" on the Condensed Consolidated Balance Sheets (unaudited).