Segment Data - Schedule of summarized financial information by segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 2,607.5	$ 2,118.8	$ 2,121.7	$ 1,903.0	$ 2,401.9	$ 2,076.0	$ 1,974.3	$ 1,767.7	$ 8,751.0	$ 8,219.9	$ 6,923.9
Americas
Segment Reporting Information [Line Items]
Revenue									6,172.1	5,724.7
EMEA
Segment Reporting Information [Line Items]
Revenue									1,038.2	999.8
APAC
Segment Reporting Information [Line Items]
Revenue									1,540.7	1,495.4
Operating segments
Segment Reporting Information [Line Items]
Revenue									$ 8,751.0	$ 8,219.9	6,923.9
Change in revenue amount									6.00%	19.00%
Operating segments | Americas
Segment Reporting Information [Line Items]
Revenue									$ 6,172.1	$ 5,724.7	4,600.2
Adjusted EBITDA									$ 499.8	$ 450.3	344.6
Change in revenue amount									8.00%	24.00%
Change in adjusted EBIDTA									11.00%	31.00%
Operating segments | EMEA
Segment Reporting Information [Line Items]
Revenue									$ 1,038.2	$ 999.8	863.3
Adjusted EBITDA									$ 100.4	$ 107.9	108.8
Change in revenue amount									4.00%	16.00%
Change in adjusted EBIDTA									(7.00%)	(1.00%)
Operating segments | APAC
Segment Reporting Information [Line Items]
Revenue									$ 1,540.7	$ 1,495.4	1,460.4
Adjusted EBITDA									$ 124.2	$ 100.9	$ 75.1
Change in revenue amount									3.00%	2.00%
Change in adjusted EBIDTA									23.00%	34.00%