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Equity Method Investments - Schedule of Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 49.6	$ 34.1
Income from equity affiliates	(6.9)	(131.2)	$ (82.1)
Equity method investment related to Middlemount
Schedule of Equity Method Investments [Line Items]
Advances to related parties	0.0	168.4	43.5
Equity method investment related to Middlemount
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	42.5	27.1
Income from equity affiliates	(14.8)	(135.1)	(82.1)
Equity method investment related to R3
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	7.1	7.0
Income from equity affiliates	$ 7.9	$ 3.9	$ 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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- Definition

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

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