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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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