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Derivative Instruments, Hedging Activities and Fair Value Measurements, Asset Balance Sheet Offsetting (Details) - Commodity Derivatives [Member] - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 127.8 $ 161.9
Gross Amounts Offset in the Balance Sheet 0.0 0.0
Amounts of Assets Presented in the Balance Sheet 127.8 161.9
Financial Instruments (115.3) (158.6)
Cash Collateral Paid (11.0) 0.0
Cash Collateral Received 0.0 0.0
Amounts That Would Have Been Presented On Net Basis $ 1.5 $ 3.3