Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue and Long-Lived Assets and Goodwill by Geographic Region
Revenue	$ 3,435.0	$ 3,206.5	$ 10,433.6	$ 9,414.1
Americas
Revenue and Long-Lived Assets and Goodwill by Geographic Region
Revenue	1,894.3	1,916.3	5,957.8	5,703.8
Long-lived assets and goodwill	7,567.2	7,632.5	7,567.2	7,632.5
EMEA
Revenue and Long-Lived Assets and Goodwill by Geographic Region
Revenue	1,082.4	920.2	3,170.1	2,661.2
Long-lived assets and goodwill	2,991.1	3,005.0	2,991.1	3,005.0
Asia-Pacific
Revenue and Long-Lived Assets and Goodwill by Geographic Region
Revenue	458.3	370.0	1,305.7	1,049.1
Long-lived assets and goodwill	$ 686.1	$ 642.0	$ 686.1	$ 642.0