Fair Value Measurements - Summary of Fair and Carrying Value of Debt Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 26, 2023	Dec. 31, 2022	Feb. 28, 2021	Apr. 30, 2020
Debt Instrument
Interest rate on senior notes	3.625%
Long-term debt, gross	$ 7,217.3
Senior Notes
Debt Instrument
Notes payable, fair value	6,287.7		$ 5,410.2
2023 Term Loan 364-day tranche | Senior Notes
Debt Instrument
Notes payable, fair value	150.0		0.0
Current portion of notes payable and term loan | Senior Notes
Debt Instrument
Notes payable, fair value	150.0		0.0
2023 Term loan three-year tranche | Senior Notes
Debt Instrument
Notes payable, fair value	500.0		0.0
4.050% Senior Notes due September 15, 2025 | Senior Notes
Debt Instrument
Notes payable, fair value	$ 1,721.5		1,699.9
Interest rate on senior notes	4.05%
2.250% Senior Notes due May 1, 2030 | Senior Notes
Debt Instrument
Notes payable, fair value	$ 1,279.3		1,219.0
Interest rate on senior notes	2.25%				2.25%
5.200% Senior Notes due September 15, 2045 | Senior Notes
Debt Instrument
Notes payable, fair value	$ 1,089.7		1,033.2
Interest rate on senior notes	5.20%			5.20%
3.150% Senior Notes due May 1, 2050 | Senior Notes
Debt Instrument
Notes payable, fair value	$ 1,049.0		989.0
Interest rate on senior notes	3.15%				3.15%
3.250% Senior Notes due February 15, 2051 | Senior Notes
Debt Instrument
Notes payable, fair value	$ 498.2		469.1
Interest rate on senior notes	3.25%			3.25%
Non-current portion of notes payable and term loan | Senior Notes
Debt Instrument
Notes payable, fair value	$ 6,137.7		$ 5,410.2
The Credit Facility | Line of Credit | Reata Pharmaceuticals, Inc | Secured Debt
Debt Instrument
Long-term debt, gross		$ 1,000.0