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DISCONTINUED OPERATIONS: Narrative (Details) - Acxiom Marketing Solutions - Discontinued Operations
$ in Millions
12 Months Ended
Mar. 31, 2019
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Cash proceeds from disposal of operations $ 2,300.0
Closing adjustments and transaction costs 49.0
Repayments of debt 230.5
Discontinued operation, gain (loss) on disposal of discontinued operation, net of tax $ 1,700.0