Segment Data - Schedule of adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Depreciation and amortization	$ (74.6)	$ (74.3)	$ (146.6)	$ (147.8)
Interest expense, net of interest income	(38.8)	(38.2)	(75.3)	(75.4)
Benefit (provision) from income taxes	7.7	(11.4)	34.2	29.5
Integration and other costs related to merger	(17.5)	(22.3)	(34.8)	(44.2)
Pre-IPO stock-based compensation	(5.9)	(10.6)	(12.2)	(22.2)
Acquisition related costs and efficiency initiatives	(70.5)	(6.0)	(86.4)	(9.7)
Other	(20.0)	(5.4)	(23.9)	(7.7)
Net income (loss)	(100.8)	6.3	(155.9)	(14.6)
Operating segments | Americas
Segment Reporting Information [Line Items]
Acquisition related costs and efficiency initiatives	53.8	122.5	117.9	192.8
Operating segments | EMEA
Segment Reporting Information [Line Items]
Acquisition related costs and efficiency initiatives	26.1	15.4	22.7	15.2
Operating segments | APAC
Segment Reporting Information [Line Items]
Acquisition related costs and efficiency initiatives	$ 38.9	$ 36.6	$ 48.5	$ 54.9