Fair Value Measurements - Financial Assets and Liabilities Subject to Fair Value Measurements (Details) - Recurring Basis - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Financial instruments carried at fair value (asset positions):
Prepaid expenses and other current assets, foreign currency forward contracts	$ 37.8	$ 47.5
Other assets, foreign currency forward contracts	3.4	0.8
Total financial assets	8,195.9	7,807.9
Financial instruments carried at fair value (liability positions):
Other current liabilities, foreign currency forward contracts	(0.7)	(14.3)
Other current liabilities, contingent consideration	(15.0)	(14.6)
Other long-term liabilities, foreign currency forward contracts	0.0	(0.9)
Contingent consideration	(112.7)	(114.4)
Total financial liabilities	(128.4)	(144.2)
Level 1
Financial instruments carried at fair value (asset positions):
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	4,865.8	5,378.5
Financial instruments carried at fair value (liability positions):
Other current liabilities, foreign currency forward contracts	0.0	0.0
Other current liabilities, contingent consideration	0.0	0.0
Other long-term liabilities, 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):
Prepaid expenses and other current assets, foreign currency forward contracts	37.8	47.5
Other assets, foreign currency forward contracts	3.4	0.8
Total financial assets	3,330.1	2,429.4
Financial instruments carried at fair value (liability positions):
Other current liabilities, foreign currency forward contracts	(0.7)	(14.3)
Other current liabilities, contingent consideration	0.0	0.0
Other long-term liabilities, foreign currency forward contracts	0.0	(0.9)
Contingent consideration	0.0	0.0
Total financial liabilities	(0.7)	(15.2)
Level 3
Financial instruments carried at fair value (asset positions):
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
Other current liabilities, contingent consideration	(15.0)	(14.6)
Other long-term liabilities, foreign currency forward contracts	0.0	0.0
Contingent consideration	(112.7)	(114.4)
Total financial liabilities	(127.7)	(129.0)
Money market funds
Financial instruments carried at fair value (asset positions):
Cash equivalents:	3,753.4	5,162.6
Money market funds \| Level 1
Financial instruments carried at fair value (asset positions):
Cash equivalents:	3,753.4	5,162.6
Money market funds \| Level 2
Financial instruments carried at fair value (asset positions):
Cash equivalents:	0.0	0.0
Money market funds \| Level 3
Financial instruments carried at fair value (asset positions):
Cash equivalents:	0.0	0.0
Time deposits
Financial instruments carried at fair value (asset positions):
Cash equivalents:	1,550.0	2,000.0
Time deposits \| Level 1
Financial instruments carried at fair value (asset positions):
Cash equivalents:	0.0	0.0
Time deposits \| Level 2
Financial instruments carried at fair value (asset positions):
Cash equivalents:	1,550.0	2,000.0
Time deposits \| Level 3
Financial instruments carried at fair value (asset positions):
Cash equivalents:	0.0	0.0
Corporate equity securities
Financial instruments carried at fair value (asset positions):
Marketable securities:	46.4	116.8
Corporate equity securities \| Level 1
Financial instruments carried at fair value (asset positions):
Marketable securities:	46.4	88.8
Corporate equity securities \| Level 2
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	28.0
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):
Cash equivalents:	236.8	0.0
Marketable securities:	408.2	0.0
U.S. Treasury securities \| Level 1
Financial instruments carried at fair value (asset positions):
Cash equivalents:	236.8	0.0
Marketable securities:	408.2	0.0
U.S. Treasury securities \| Level 2
Financial instruments carried at fair value (asset positions):
Cash equivalents:	0.0	0.0
Marketable securities:	0.0	0.0
U.S. Treasury securities \| Level 3
Financial instruments carried at fair value (asset positions):
Cash equivalents:	0.0	0.0
Marketable securities:	0.0	0.0
Government-sponsored enterprise securities
Financial instruments carried at fair value (asset positions):
Marketable securities:	421.0	127.1
Government-sponsored enterprise securities \| Level 1
Financial instruments carried at fair value (asset positions):
Marketable securities:	421.0	127.1
Government-sponsored enterprise securities \| Level 2
Financial instruments carried at fair value (asset positions):
Marketable securities:	0.0	0.0
Government-sponsored enterprise 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:	237.8	0.0
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:	237.8	0.0
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:	31.7	0.0
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:	31.7	0.0
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):
Cash equivalents:	0.0	5.8
Marketable securities:	1,214.2	87.0
Corporate debt securities \| Level 1
Financial instruments carried at fair value (asset positions):
Cash equivalents:	0.0	0.0
Marketable securities:	0.0	0.0
Corporate debt securities \| Level 2
Financial instruments carried at fair value (asset positions):
Cash equivalents:	0.0	5.8
Marketable securities:	1,214.2	87.0
Corporate debt securities \| Level 3
Financial instruments carried at fair value (asset positions):
Cash equivalents:	0.0	0.0
Marketable securities:	0.0	0.0
Commercial paper
Financial instruments carried at fair value (asset positions):
Cash equivalents:	96.5	204.5
Marketable securities:	158.7	55.8
Commercial paper \| Level 1
Financial instruments carried at fair value (asset positions):
Cash equivalents:	0.0	0.0
Marketable securities:	0.0	0.0
Commercial paper \| Level 2
Financial instruments carried at fair value (asset positions):
Cash equivalents:	96.5	204.5
Marketable securities:	158.7	55.8
Commercial paper \| Level 3
Financial instruments carried at fair value (asset positions):
Cash equivalents:	0.0	0.0
Marketable securities:	$ 0.0	$ 0.0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
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Amount of investment in marketable security.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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