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Contingencies Contingencies Details - USD ($)	3 Months Ended		12 Months Ended
Contingencies Contingencies Details - USD ($)	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Loss Contingencies [Line Items]
Loss Contingency, Loss in Period	$ 30,500,000
Tax Adjustments, Settlements, and Unusual Provisions	22,300,000	$ 600,000
Ramirez v. Trans Union LLC [Member] \| Judicial Ruling [Member] \| Punitive Damages [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value	32,000,000.0		$ 52,000,000.0
Tax Adjustments, Settlements, and Unusual Provisions	7,600,000
Per person [Member] \| Ramirez v. Trans Union LLC [Member] \| Judicial Ruling [Member] \| Punitive Damages [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value	$ 3,936.88		$ 6,353.08