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Acquisitions and Other Strategic Initiatives - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Mar. 31, 2020
Feb. 13, 2020
Regulatory Data Corporation      
Business Acquisition [Line Items]      
Business acquisition interests acquired     100.00%
Acquired cash included in current assets     $ 6
Accounts receivable gross included in current assets     $ 14
Vigeo Eiris      
Business Acquisition [Line Items]      
Business acquisition interests acquired 99.80% 69.20%