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Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Equity Method Investments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 53.9		$ 53.9		$ 49.6
Loss (income) from equity affiliates	2.1	$ (5.6)	7.1	$ (9.7)
Middlemount Mine
Schedule of Equity Method Investments [Line Items]
Equity method investments	47.3		47.3		42.5
Loss (income) from equity affiliates	(2.2)	(8.2)	(4.1)	(14.9)
R3 Renewables
Schedule of Equity Method Investments [Line Items]
Equity method investments	6.6		6.6		$ 7.1
Loss (income) from equity affiliates	$ 4.3	$ 2.6	$ 11.2	$ 5.2

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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- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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