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Acquisitions - Narrative (Details) $ in Thousands, € in Millions						1 Months Ended	3 Months Ended		4 Months Ended	5 Months Ended	6 Months Ended		12 Months Ended
	Jul. 01, 2019 EUR (€)	Jul. 01, 2019 USD ($)	Mar. 05, 2019 USD ($)	Feb. 14, 2019 USD ($)	Jan. 24, 2019 USD ($)	Oct. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Payment for trade accounts receivable portfolio						$ 223,400
Premium in excess of receivables' estimated fair value													$ 162,800
Payment in escrow for carrying value of accounts receivable													38,900
Term of agreement						13 years
Acquisition and merger costs related to business combinations							$ 5,900	$ 0			$ 9,000	$ 0
Purchase price of acquisition, net of cash acquired											571,552	$ 0
Goodwill							2,325,942		$ 2,325,942	$ 2,325,942	2,325,942		$ 1,832,129
Discovery Benefits
Business Acquisition [Line Items]
Consideration transferred			$ 525,600
Deferred cash consideration			50,000
Fair value of equity interests acquired			100,000
Revenue from acquiree since acquisition									36,800
Purchase price of acquisition, net of cash acquired			249,781
Goodwill			272,248
Accounts receivable acquired			$ 10,722
Noventis
Business Acquisition [Line Items]
Consideration transferred					$ 338,700
Revenue from acquiree since acquisition										20,200
Amount of accelerated vesting of options					$ 5,500
Goodwill							212,814		212,814	212,814	212,814
Accounts receivable acquired							22,134		22,134	22,134	22,134
Pavestone Capital
Business Acquisition [Line Items]
Purchase price of acquisition, net of cash acquired				$ 28,000
Goodwill				9,600
Accounts receivable acquired				14,800
Discovery Benefits
Business Acquisition [Line Items]
Ownership percentage by noncontrolling interest			4.90%
Subsequent Event | Go Fuel Card
Business Acquisition [Line Items]
Consideration transferred	€ 235.0	$ 266,000
Customer relationships
Business Acquisition [Line Items]
Asset acquisition, customer relationship intangible assets							168,000		168,000	168,000	168,000
Customer relationships | Discovery Benefits
Business Acquisition [Line Items]
Customer relationships acquired			$ 213,600
Customer relationships | Noventis
Business Acquisition [Line Items]
Customer relationships acquired							$ 100,900		$ 100,900	$ 100,900	$ 100,900
Customer relationships | Pavestone Capital
Business Acquisition [Line Items]
Customer relationships acquired				$ 3,900

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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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