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Equity Method Investments - Schedule of Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 58.5	$ 49.6
Income from equity affiliates	(11.5)	(6.9)	$ (131.2)
Equity method investment related to Middlemount
Schedule of Equity Method Investments [Line Items]
Advances to investments	0.0	0.0	168.4
Equity method investment related to Middlemount
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	52.7	42.5
Income from equity affiliates	(14.9)	(14.8)	(135.1)
Equity method investment related to R3 II
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	0.0	7.1
Income from equity affiliates	3.3	7.9	3.9
Other Equity Method Investments Related to R3 II
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	5.8	0.0
Income from equity affiliates	$ 0.1	$ 0.0	$ 0.0

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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