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Investments - Investments in NGP (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Total	$ 3,292.3	$ 3,024.1
Investment in NGP Management
Schedule of Equity Method Investments [Line Items]
Total	369.2	370.5
Investments in NGP general partners - accrued performance allocations
Schedule of Equity Method Investments [Line Items]
Total	489.4	484.4
Principal investments in NGP funds
Schedule of Equity Method Investments [Line Items]
Total	53.4	61.3
Total investments in NGP
Schedule of Equity Method Investments [Line Items]
Total	$ 912.0	$ 916.2

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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