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Segment Information - Data by geographic area (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue from external customers and Long-lived assets, net                      
Revenues $ 5,398.0 $ 5,524.4 $ 5,383.4 $ 5,081.1 $ 4,887.8 $ 5,152.0 $ 5,254.1 $ 4,824.6 $ 21,386.9 $ 20,118.5 $ 19,284.9
Long-lived assets, net 3,379.6       2,728.2       3,379.6 2,728.2  
U.S.                      
Revenue from external customers and Long-lived assets, net                      
Revenues                 12,487.2 12,005.9 11,806.9
Long-lived assets, net 2,268.1       1,847.3       2,268.1 1,847.3  
Foreign                      
Revenue from external customers and Long-lived assets, net                      
Revenues                 8,899.7 8,112.6 $ 7,478.0
Long-lived assets, net $ 1,111.5       $ 880.9       $ 1,111.5 $ 880.9