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Investments (Debt Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	$ 2,343.0	$ 2,806.3
Accumulated unrealized losses	(10.4)	(5.0)
Fair value	2,332.6	2,801.3
Contractual maturity:
Due in one year or less	1,958.2
Due in one to five years	371.4
Due in five to ten years	2.7
Due after ten years	0.3
Fair value	2,332.6	2,801.3
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	778.7	897.4
Accumulated unrealized losses	0.0	0.0
Fair value	778.7	897.4
Contractual maturity:
Fair value	778.7	897.4
Government bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	609.6	655.9
Accumulated unrealized losses	(3.8)	(3.3)
Fair value	605.8	652.6
Contractual maturity:
Fair value	605.8	652.6
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	585.8	705.5
Accumulated unrealized losses	(6.3)	(1.6)
Fair value	579.5	703.9
Contractual maturity:
Fair value	579.5	703.9
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	330.1	355.5
Accumulated unrealized losses	(0.3)	(0.1)
Fair value	329.8	355.4
Contractual maturity:
Fair value	329.8	355.4
Other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	38.8	192.0
Accumulated unrealized losses	0.0	0.0
Fair value	38.8	192.0
Contractual maturity:
Fair value	$ 38.8	$ 192.0
Weighted Average
Contractual maturity:
Weighted average life	6 months

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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