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Derivative Instruments, Hedging Activities and Fair Value Measurements, Asset Balance Sheet Offsetting (Details) - Commodity Derivatives [Member] - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 202.3 $ 161.9
Gross Amounts Offset in the Balance Sheet 0.0 0.0
Amounts of Assets Presented in the Balance Sheet 202.3 161.9
Financial Instruments (137.7) (158.6)
Cash Collateral Received (64.6) 0.0
Cash Collateral Paid 0.0 0.0
Amounts That Would Have Been Presented On Net Basis $ 0.0 $ 3.3