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Segment Information - Reconciliation of Adjusted Operating Income to Income Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Adjusted operating income	$ 184,561	$ 159,009	$ 331,703	$ 310,302
Stock-based compensation			24,861	15,860
Operating income	94,737	100,424	163,672	184,283
Financing interest expense	(35,638)	(25,505)	(66,750)	(52,842)
Net foreign currency gain (loss)	6,665	(26,734)	2,780	(26,344)
Net unrealized gains on financial instruments	(21,516)	2,706	(33,428)	16,214
Income before income taxes	44,248	50,891	66,274	121,311
Fleet Solutions
Segment Reporting Information [Line Items]
Adjusted operating income	122,577	112,953	215,552	220,926
Travel and corporate solutions
Segment Reporting Information [Line Items]
Adjusted operating income	40,838	34,448	75,225	59,697
Health and Employee Benefit Solutions
Segment Reporting Information [Line Items]
Adjusted operating income	21,146	11,608	40,926	29,679
Segment reconciling items
Segment Reporting Information [Line Items]
Unallocated corporate expenses	18,177	15,044	35,119	28,964
Acquisition-related intangible amortization	39,814	34,921	73,702	70,157
Other acquisition and divestiture related items	7,017	619	16,797	1,256
Debt restructuring costs	5,078	466	9,478	3,481
Stock-based compensation	14,992	6,905	25,434	15,860
Restructuring and other costs	$ 4,746	$ 630	$ 7,501	$ 6,301

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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