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Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 51.6		$ 51.6		$ 58.5
Loss from equity affiliates	0.9	$ 1.3	7.6	$ 5.0
Middlemount Mine
Schedule of Equity Method Investments [Line Items]
Equity method investments	48.2		48.2		52.7
Loss from equity affiliates	0.5	(2.3)	6.8	(1.9)
R3 Renewables
Schedule of Equity Method Investments [Line Items]
Equity method investments	0.0		0.0		0.0
Loss from equity affiliates	0.0	$ 3.6	0.0	6.9
R3 Renewables II
Schedule of Equity Method Investments [Line Items]
Equity method investments	3.4		3.4		$ 5.8
Loss from equity affiliates	$ 0.4		$ 0.8	$ 0.0

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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