Segment Data - Schedule of summarized financial information by segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 1,931.6	$ 2,118.8	$ 5,570.6	$ 6,143.5
Percent change in revenue amount	(9.00%)		(9.00%)
Americas
Segment Reporting Information [Line Items]
Total revenue	$ 1,416.1	1,512.8	$ 4,059.4	4,353.3
EMEA
Segment Reporting Information [Line Items]
Total revenue	223.2	235.5	638.3	667.0
APAC
Segment Reporting Information [Line Items]
Total revenue	292.3	370.5	872.9	1,123.2
Operating segments | Americas
Segment Reporting Information [Line Items]
Total revenue	$ 1,416.1	1,512.8	$ 4,059.4	4,353.3
Percent change in revenue amount	(6.00%)		(7.00%)
Adjusted EBITDA	$ 81.2	125.2	$ 199.1	318.0
Percent change in adjusted EBIDTA	(35.00%)		(37.00%)
Operating segments | EMEA
Segment Reporting Information [Line Items]
Total revenue	$ 223.2	235.5	$ 638.3	667.0
Percent change in revenue amount	(5.00%)		(4.00%)
Adjusted EBITDA	$ 11.5	20.3	$ 34.2	35.5
Percent change in adjusted EBIDTA	(43.00%)		(4.00%)
Operating segments | APAC
Segment Reporting Information [Line Items]
Total revenue	$ 292.3	370.5	$ 872.9	1,123.2
Percent change in revenue amount	(21.00%)		(22.00%)
Adjusted EBITDA	$ 24.4	$ 23.0	$ 72.9	$ 77.9
Percent change in adjusted EBIDTA	6.00%		(6.00%)