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Acquisitions (Notes)
 3 Months Ended
Mar. 31, 2019
Business Combinations [Abstract]  
Acquisitions
Acquisitions
Acxiom Acquisition
On October 1, 2018 (the "acquisition date"), the Company completed its acquisition of Acxiom (the "Acxiom Acquisition"). The purchase accounting process has not been completed primarily because the valuation of acquired assets has not been finalized. We expect to complete the purchase accounting as soon as practicable but no later than one year from the acquisition date. We do not believe there will be material adjustments.
Redeemable Noncontrolling Interests
Many of our acquisitions include provisions under which the noncontrolling equity owners may require us to purchase additional interests in a subsidiary at their discretion. Redeemable noncontrolling interests are adjusted quarterly to their estimated redemption value, but not less than their initial fair value. Any adjustments to the redemption value impact retained earnings or additional paid in capital, except for foreign currency translation adjustments.
The following table presents changes in our redeemable noncontrolling interests.
 
Three months ended
March 31,
 
2019
 
2018
Balance at beginning of period
$
167.9

 
$
252.1

Change in related noncontrolling interests balance
(2.8
)
 
(2.8
)
Changes in redemption value of redeemable noncontrolling interests:
 
 
 
Redemptions
(3.1
)
 
(1.9
)
Redemption value adjustments
(0.2
)
 
(0.5
)
Balance at end of period
$
161.8

 
$
246.9