Derivative Financial Instruments (Derivatives and Hedging-Overall-Subsequent Measurement) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivatives	$ (173.9)	$ (127.7)	$ 49.2
Product sales revenue | Commodity derivatives contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivatives	(155.2)	(143.2)	53.2
Cost of product sales | Commodity derivatives contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivatives	(16.6)	21.1	0.3
Other operating income (expense) | Basis derivative agreement
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivatives	$ (2.1)	$ (5.6)	$ (4.3)