Revenue (Disaggregation of Revenue by Geographical Area) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 5,499.4	$ 5,636.7	$ 11,359.2	$ 10,728.9
U.S.
Disaggregation of Revenue [Line Items]
Revenue	3,144.8	3,252.5	6,473.6	6,143.3
Europe
Disaggregation of Revenue [Line Items]
Revenue	873.0	928.2	1,934.1	1,828.5
Japan
Disaggregation of Revenue [Line Items]
Revenue	666.7	653.2	1,259.0	1,196.9
China
Disaggregation of Revenue [Line Items]
Revenue	239.8	230.9	507.1	442.1
Other foreign countries
Disaggregation of Revenue [Line Items]
Revenue	$ 575.2	$ 571.9	$ 1,185.5	$ 1,118.1