Marketable Securities and Equity Investments - Summary of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Total marketable debt securities
Fair Value	$ 5,683.1	$ 3,977.1
Corporate equity securities
Amortized Cost	69.4	69.4
Gross Unrealized Gains	12.3	167.1
Gross Unrealized Losses	(10.6)	(5.6)
Fair Value	71.1	230.9
Amortized Cost	553.0	568.9
Gross Unrealized Gains	12.3	167.1
Gross Unrealized Losses	(14.1)	(6.1)
Fair Value	551.2	729.9
Cash equivalents:
Total marketable debt securities
Amortized Cost	5,203.0	3,478.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	5,203.0	3,478.1
Cash equivalents: \| Money market funds
Total marketable debt securities
Amortized Cost	5,186.8	3,478.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	5,186.8	3,478.1
Cash equivalents: \| Commercial paper
Total marketable debt securities
Amortized Cost	16.2	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	16.2	0.0
Marketable securities
Total marketable debt securities
Amortized Cost	483.6	499.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(3.5)	(0.5)
Fair Value	480.1	499.0
Marketable securities \| U.S. Treasury securities
Total marketable debt securities
Amortized Cost	155.4	86.6
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(1.9)	(0.2)
Fair Value	153.5	86.4
Marketable securities \| Government-sponsored enterprise securities
Total marketable debt securities
Amortized Cost	10.6	69.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	0.0
Fair Value	10.5	69.0
Marketable securities \| Corporate debt securities
Total marketable debt securities
Amortized Cost	75.7	91.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.7)	(0.2)
Fair Value	75.0	90.9
Marketable securities \| Commercial paper
Total marketable debt securities
Amortized Cost	241.9	252.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.8)	(0.1)
Fair Value	$ 241.1	$ 252.7

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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