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Segment Reporting (Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax $ 9,041.4 $ 9,352.0 $ 8,306.5