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Financial Instruments - Summary of Financial Assets with Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Line Items]
Cash equivalents	$ 626.9	$ 2,541.1
Commercial paper
Cash and Cash Equivalents [Line Items]
Cash equivalents	61.1	384.4
Overnight reverse repurchase agreements
Cash and Cash Equivalents [Line Items]
Cash equivalents	37.4	368.8
Money market funds
Cash and Cash Equivalents [Line Items]
Cash equivalents	505.1	1,628.5
Short-term debt securities
Cash and Cash Equivalents [Line Items]
Cash equivalents	$ 23.3	$ 159.4

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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