Fair Value - Change in Fair Value for the Equity Investment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Equity Method Investments
Beginning balance	$ 535.0
Change in fair value	165.4	$ 0.0	$ 0.0
Ending balance	795.7	535.0
Indicor
Equity Method Investments
Beginning balance	535.0
Change in fair value	140.9
Ending balance	$ 675.9	$ 535.0