Fair Value Measurements - Financial Assets and Liabilities Subject to Fair Value Measurements (Details) - Recurring Basis - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Financial instruments carried at fair value (asset positions):
Cash equivalents	$ 2,569.8	$ 2,779.1
Prepaid expenses and other current assets, Foreign currency forward contracts	36.1	6.2
Other assets, Foreign currency forward contracts	39.4	12.7
Total financial assets	10,149.0	10,033.6
Financial instruments carried at fair value (liability positions):
Other current liabilities, Foreign currency forward contracts	(50.1)	(79.4)
Foreign currency forward contracts	(28.1)	(51.0)
Contingent consideration	(79.2)	(79.0)
Total financial liabilities	(157.4)	(209.4)
Level 1
Financial instruments carried at fair value (asset positions):
Cash equivalents	1,312.8	1,770.7
Prepaid expenses and other current assets, Foreign currency forward contracts	0.0	0.0
Other assets, Foreign currency forward contracts	0.0	0.0
Total financial assets	3,078.0	3,652.2
Financial instruments carried at fair value (liability positions):
Other current liabilities, Foreign currency forward contracts	0.0	0.0
Foreign currency forward contracts	0.0	0.0
Contingent consideration	0.0	0.0
Total financial liabilities	0.0	0.0
Level 2
Financial instruments carried at fair value (asset positions):
Cash equivalents	1,257.0	1,008.4
Prepaid expenses and other current assets, Foreign currency forward contracts	36.1	6.2
Other assets, Foreign currency forward contracts	39.4	12.7
Total financial assets	7,071.0	6,381.4
Financial instruments carried at fair value (liability positions):
Other current liabilities, Foreign currency forward contracts	(50.1)	(79.4)
Foreign currency forward contracts	(28.1)	(51.0)
Contingent consideration	0.0	0.0
Total financial liabilities	(78.2)	(130.4)
Level 3
Financial instruments carried at fair value (asset positions):
Cash equivalents	0.0	0.0
Prepaid expenses and other current assets, Foreign currency forward contracts	0.0	0.0
Other assets, Foreign currency forward contracts	0.0	0.0
Total financial assets	0.0	0.0
Financial instruments carried at fair value (liability positions):
Other current liabilities, Foreign currency forward contracts	0.0	0.0
Foreign currency forward contracts	0.0	0.0
Contingent consideration	(79.2)	(79.0)
Total financial liabilities	(79.2)	(79.0)
Corporate equity securities
Financial instruments carried at fair value (asset positions):
Marketable securities:	20.4	16.6
Corporate equity securities \| Level 1
Financial instruments carried at fair value (asset positions):
Marketable securities:	20.4	16.6
Corporate equity securities \| Level 2
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
Corporate equity securities \| Level 3
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
U.S. Treasury securities
Financial instruments carried at fair value (asset positions):
Marketable securities:	1,744.8	1,864.9
U.S. Treasury securities \| Level 1
Financial instruments carried at fair value (asset positions):
Marketable securities:	1,744.8	1,864.9
U.S. Treasury securities \| Level 2
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
U.S. Treasury securities \| Level 3
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
U.S. government agency securities
Financial instruments carried at fair value (asset positions):
Marketable securities:	208.2	262.4
U.S. government agency securities \| Level 1
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
U.S. government agency securities \| Level 2
Financial instruments carried at fair value (asset positions):
Marketable securities:	208.2	262.4
U.S. government agency securities \| Level 3
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
Asset-backed securities
Financial instruments carried at fair value (asset positions):
Marketable securities:	1,293.6	1,357.0
Asset-backed securities \| Level 1
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
Asset-backed securities \| Level 2
Financial instruments carried at fair value (asset positions):
Marketable securities:	1,293.6	1,357.0
Asset-backed securities \| Level 3
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
Certificates of deposit
Financial instruments carried at fair value (asset positions):
Marketable securities:	36.6	26.2
Certificates of deposit \| Level 1
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
Certificates of deposit \| Level 2
Financial instruments carried at fair value (asset positions):
Marketable securities:	36.6	26.2
Certificates of deposit \| Level 3
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
Corporate debt securities
Financial instruments carried at fair value (asset positions):
Marketable securities:	4,170.5	3,693.9
Corporate debt securities \| Level 1
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
Corporate debt securities \| Level 2
Financial instruments carried at fair value (asset positions):
Marketable securities:	4,170.5	3,693.9
Corporate debt securities \| Level 3
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
Commercial paper
Financial instruments carried at fair value (asset positions):
Marketable securities:	29.6	14.6
Commercial paper \| Level 1
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
Commercial paper \| Level 2
Financial instruments carried at fair value (asset positions):
Marketable securities:	29.6	14.6
Commercial paper \| Level 3
Financial instruments carried at fair value (asset positions):
Marketable securities:	$ 0.0	$ 0.0

Fair value portion of asset recognized for present right to economic benefit.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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