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Investments - Schedule of Investments in Marketable Securities and Other Investments (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Equity securities	$ 37.1		$ 32.3
Debt securities	48.4		24.3
Total investments in marketable securities	85.5		56.6
Investments measured at NAV as a practical expedient	523.8		488.6
Investments without readily determinable fair values	50.4	$ 50.4	50.4	$ 50.4	$ 50.4	$ 50.4
Total other investments	574.2	$ 566.1	539.0	$ 532.8	$ 530.3	$ 480.9
Investments	$ 659.7		$ 595.6

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