Derivative Instruments Gain (Loss) Table (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Derivative Instruments Gain (Loss) Table[Line Items]
Derivative gain (loss) recorded in income	$ (9.0)	$ 0.0	$ (9.6)	$ 0.0
Forward natural gas contracts
Derivative Instruments Gain (Loss) Table[Line Items]
Forward natural gas contracts	Costs Associated With Product Sales		Costs Associated With Product Sales
NYMEX/ICE natural gas contracts	Costs Associated With Product Sales		Costs Associated With Product Sales
Derivative gain (loss) recorded in income	$ (10.2)	0.0	$ (12.1)	0.0
NYMEX/ICE Natural Gas Contracts
Derivative Instruments Gain (Loss) Table[Line Items]
Forward natural gas contracts	Costs Associated With Product Sales		Costs Associated With Product Sales
NYMEX/ICE natural gas contracts	Costs Associated With Product Sales		Costs Associated With Product Sales
Derivative gain (loss) recorded in income	$ 1.2	$ 0.0	$ 2.5	$ 0.0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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