Revenues (Disaggregation of Revenues) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Sales by Company-operated restaurants	$ 2,594.9	$ 3,569.6	$ 5,130.5	$ 6,981.5
Revenues from franchised restaurants	2,759.0	2,480.1	5,362.3	4,744.1
Total revenues	5,353.9	6,049.7	10,492.8	11,725.6
United States
Disaggregation of Revenue [Line Items]
Sales by Company-operated restaurants	696.8	849.5	1,405.5	1,685.1
Revenues from franchised restaurants	1,264.4	1,198.9	2,422.9	2,292.3
Total revenues	1,961.2	2,048.4	3,828.4	3,977.4
International Lead Markets
Disaggregation of Revenue [Line Items]
Sales by Company-operated restaurants	1,022.7	1,021.4	2,029.8	1,962.6
Revenues from franchised restaurants	908.2	791.8	1,778.6	1,494.1
Total revenues	1,930.9	1,813.2	3,808.4	3,456.7
High Growth Markets
Disaggregation of Revenue [Line Items]
Sales by Company-operated restaurants	732.6	1,459.3	1,432.9	2,804.6
Revenues from franchised restaurants	281.4	219.9	553.3	411.8
Total revenues	1,014.0	1,679.2	1,986.2	3,216.4
Foundational Markets and Corporate
Disaggregation of Revenue [Line Items]
Sales by Company-operated restaurants	142.8	239.4	262.3	529.2
Revenues from franchised restaurants	305.0	269.5	607.5	545.9
Total revenues	$ 447.8	$ 508.9	$ 869.8	$ 1,075.1

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.

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Revenue earned during the period from consideration (often a percentage of the franchisee's sales) received for the right to operate a business using the entity's name, merchandise, services, methodologies, promotional support, marketing, and supplies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 952
-SubTopic 605
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68058139&loc=d3e68564-108043

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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