Fair Value - Change in Fair Value for the Equity Investment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Equity Method Investments
Balance at beginning of period			$ 535.0
Change in fair value	$ 33.9	$ 0.0	98.7	$ 0.0
Balance at end of period	736.4		736.4
Indicor
Equity Method Investments
Balance at beginning of period	591.3		535.0
Change in fair value	20.1		76.4
Balance at end of period	$ 611.4		$ 611.4