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Segment Information - Reconciliation of Adjusted Net Income to Net Income (Details) - USD ($) $ in Thousands		12 Months Ended
	Mar. 05, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Adjusted operating income		$ 542,367	$ 734,608	$ 639,956
Acquisition-related intangible amortization	$ 266,300	171,100	159,400	138,200
Legal settlement		162,500	0	0
Loss on sale of subsidiary		46,362	0	0
Stock-based compensation		63,863	45,811	33,887
Operating (loss) income		(91,673)	385,841	380,638
Financing interest expense		(157,080)	(134,677)	(105,023)
Net foreign currency loss		(25,783)	(926)	(38,800)
Non-cash adjustments related to tax receivable agreement		491	932	(775)
Net unrealized (loss) gain on financial instruments		(27,036)	(34,654)	2,579
(Loss) income before income taxes		(301,081)	216,516	238,619
Segment Reconciling Items
Segment Reporting Information [Line Items]
Unallocated corporate expenses		62,938	67,982	58,095
Acquisition-related intangible amortization		171,144	159,431	138,186
Other acquisition and divestiture related items		57,787	37,675	4,143
Legal settlement		162,500	0	0
Impairment charges		53,378	0	5,649
Loss on sale of subsidiary		46,362	0	0
Debt restructuring costs		535	11,062	4,425
Stock-based compensation		65,841	47,511	35,103
Other costs		13,555	25,106	13,717
Fleet Solutions
Segment Reporting Information [Line Items]
Adjusted operating income		383,502	485,539	459,646
Travel and Corporate Solutions Segment
Segment Reporting Information [Line Items]
Adjusted operating income		62,096	168,786	135,379
Health and Employee Benefit Solutions
Segment Reporting Information [Line Items]
Adjusted operating income		$ 96,769	$ 80,283	$ 44,931

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