Intangible Assets and Goodwill - Changes in Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill, beginning of year	$ 5,749.0	$ 5,761.1
Goodwill resulting from Reata acquisition	464.5	0.0
Other	5.7	(12.1)
Goodwill, end of year	$ 6,219.2	$ 5,749.0