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Summary of Significant Accounting Policies - Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Product development expenditures as percentage of total revenue	6.00%	8.00%	8.00%
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful lives (in years)	10 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful lives (in years)	20 years
Acquired software and technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful lives (in years)	4 years
Acquired software and technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful lives (in years)	10 years
Trade names | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful lives (in years)	8 years
Trade names | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful lives (in years)	20 years
Purchased software | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful lives (in years)	3 years
Purchased software | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful lives (in years)	5 years
Capitalized software and other intangibles
Finite-Lived Intangible Assets [Line Items]
Useful lives (in years)	5 years
Merchant portfolios | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful lives (in years)	6 years
Merchant portfolios | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful lives (in years)	9 years

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- Definition

Product development expenditures as percentage of revenue.

+ References

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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