Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue and Long-Lived Assets and Goodwill by Geographic Region
Revenue	$ 2,800.7	$ 3,719.8	$ 6,207.6	$ 7,188.7
Americas
Revenue and Long-Lived Assets and Goodwill by Geographic Region
Revenue	1,718.9	2,215.3	3,787.6	4,293.4
Long-lived assets and goodwill	7,574.8	7,853.9	7,574.8	7,853.9
EMEA
Revenue and Long-Lived Assets and Goodwill by Geographic Region
Revenue	762.0	1,096.9	1,740.9	2,121.4
Long-lived assets and goodwill	2,909.8	2,985.0	2,909.8	2,985.0
Asia-Pacific
Revenue and Long-Lived Assets and Goodwill by Geographic Region
Revenue	319.8	407.6	679.1	773.9
Long-lived assets and goodwill	$ 638.8	$ 640.9	$ 638.8	$ 640.9