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Segment Information (Segment and Geographic Information) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Total revenues | $ 5,138.9 | $ 5,675.9
Operating Income | 2,143.1 | 2,034.0
United States |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,867.2 | 1,929.0
Operating Income | 998.0 | 947.9
International Lead Markets |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,877.5 | 1,643.5
Operating Income | 809.7 | 666.6
High Growth Markets |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 972.2 | 1,537.2
Operating Income | 234.3 | 300.7
Foundational Markets and Corporate |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 422.0 | 566.2
Operating Income | $ 101.1 | $ 118.8

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