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Financial Instruments and Hedging Activities (Fair Values of Derivative Instruments Included on Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	$ 284.1	$ 227.0
Liability Derivatives Fair Value	10.0	97.5
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	85.5	41.4
Liability Derivatives Fair Value	7.5	79.5
Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	198.6	185.6
Liability Derivatives Fair Value	2.5	18.0
Interest Rate Contract [Member] | Prepaid Expenses and Other Current Assets [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	2.1
Interest Rate Contract [Member] | Other Liabilities [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	0.2
Interest Rate Contract [Member] | Other Assets [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	18.0	35.8
Equity [Member] | Accrued Expenses And Other Current Liabilities [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	2.5	8.6
Equity [Member] | Prepaid Expenses and Other Current Assets [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	0.0	185.6
Equity [Member] | Other Assets [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	197.6
Foreign Exchange [Member] | Accrued Expenses And Other Current Liabilities [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	7.2	64.5
Foreign Exchange [Member] | Accrued Expenses And Other Current Liabilities [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	0.0	9.4
Foreign Exchange [Member] | Prepaid Expenses and Other Current Assets [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	40.1
Foreign Exchange [Member] | Prepaid Expenses and Other Current Assets [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	1.0
Foreign Exchange [Member] | Other Liabilities [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	0.1	15.0
Foreign Exchange [Member] | Other Assets [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	$ 25.3	$ 5.6

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
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