Derivative Instruments - Derivatives Gains and Losses (Details) - Derivatives not designated as hedging instruments: - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	$ (63.9)	$ 13.1
Commodity derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives	(65.8)	15.3
Gain (loss) on derivatives not designated as hedging instruments	(23.3)	1.6
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives	1.9	(2.2)
Gain (loss) on derivatives not designated as hedging instruments	$ 1.4	$ (3.4)