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Cash, Cash Equivalents and Short-Term Investments - Unrealized Loss Position Aggregated By Investment (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Less than 12 months
Fair Value	$ 820.0	$ 941.0
Gross Unrealized Losses	(25.8)	(9.2)
More than 12 months
Fair Value	117.0	0.0
Gross Unrealized Losses	(7.2)	0.0
Total
Fair Value	937.0	941.0
Gross Unrealized Losses	(33.0)	(9.2)
Corporate notes and obligations
Less than 12 months
Fair Value	444.2	498.6
Gross Unrealized Losses	(13.5)	(4.1)
More than 12 months
Fair Value	28.9	0.0
Gross Unrealized Losses	(2.1)	0.0
Total
Fair Value	473.1	498.6
Gross Unrealized Losses	(15.6)	(4.1)
U.S. Treasury securities
Less than 12 months
Fair Value	173.7	218.0
Gross Unrealized Losses	(5.3)	(2.9)
More than 12 months
Fair Value	62.1	0.0
Gross Unrealized Losses	(3.9)	0.0
Total
Fair Value	235.8	218.0
Gross Unrealized Losses	(9.2)	(2.9)
Asset backed securities
Less than 12 months
Fair Value	117.9	120.7
Gross Unrealized Losses	(4.1)	(1.2)
More than 12 months
Fair Value	9.5	0.0
Gross Unrealized Losses	(0.3)	0.0
Total
Fair Value	127.4	120.7
Gross Unrealized Losses	(4.4)	(1.2)
Municipal securities
Less than 12 months
Fair Value	56.3	66.0
Gross Unrealized Losses	(2.3)	(0.7)
More than 12 months
Fair Value	9.5	0.0
Gross Unrealized Losses	(0.5)	0.0
Total
Fair Value	65.8	66.0
Gross Unrealized Losses	(2.8)	(0.7)
U.S. agency obligations
Less than 12 months
Fair Value	10.5	14.4
Gross Unrealized Losses	(0.3)	(0.2)
More than 12 months
Fair Value	3.5	0.0
Gross Unrealized Losses	(0.2)	0.0
Total
Fair Value	14.0	14.4
Gross Unrealized Losses	(0.5)	(0.2)
Foreign government obligations
Less than 12 months
Fair Value	11.3	15.4
Gross Unrealized Losses	(0.2)	0.0
More than 12 months
Fair Value	1.9	0.0
Gross Unrealized Losses	(0.1)	0.0
Total
Fair Value	13.2	15.4
Gross Unrealized Losses	(0.3)	0.0
Supranational securities
Less than 12 months
Fair Value	6.1	7.9
Gross Unrealized Losses	(0.1)	(0.1)
More than 12 months
Fair Value	1.6	0.0
Gross Unrealized Losses	(0.1)	0.0
Total
Fair Value	7.7	7.9
Gross Unrealized Losses	$ (0.2)	$ (0.1)

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