Financial Instruments - Fair Value Measurements and Related Valuation Techniques and Fair Value Hierarchy Level (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	$ 24.9	$ 45.9
Fair value, Measurements, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	58.7	59.2
Fair value, Measurements, Recurring \| Foreign currency contracts, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	47.5	50.3
Fair value, Measurements, Recurring \| Net investment hedges
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	(22.6)	(4.4)
Fair value, Measurements, Recurring \| Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	58.7	59.2
Fair value, Measurements, Recurring \| Level 1 \| Foreign currency contracts, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	0.0	0.0
Fair value, Measurements, Recurring \| Level 1 \| Net investment hedges
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	0.0	0.0
Fair value, Measurements, Recurring \| Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	0.0	0.0
Fair value, Measurements, Recurring \| Level 2 \| Foreign currency contracts, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	47.5	50.3
Fair value, Measurements, Recurring \| Level 2 \| Net investment hedges
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	(22.6)	(4.4)
Fair value, Measurements, Recurring \| Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	0.0	0.0
Fair value, Measurements, Recurring \| Level 3 \| Foreign currency contracts, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	0.0	0.0
Fair value, Measurements, Recurring \| Level 3 \| Net investment hedges
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	$ 0.0	$ 0.0

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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