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Acxiom Acquisition Transaction Related (Details) - Acxiom $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Term Loan | $ 500.0
Debt Issuance Face Amount | 2,000.0
Selling, General and Administrative Expense | 35.0
Interest Expense | 3.7
Interest Income | 0.4
Other expense, net | $ 10.3

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