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Acquisitions Acquisitions (Tables)
 6 Months Ended
Jun. 30, 2020
Business Combinations [Abstract]  
Redeemable Noncontrolling Interest [Table Text Block]
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, if necessary, 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.
 
Six months ended
June 30,
 
2020
 
2019
Balance at beginning of period
$
164.7

 
$
167.9

Change in related noncontrolling interests balance
(3.1
)
 
0.2

Changes in redemption value of redeemable noncontrolling interests:
 
 
 
Additions
0.0

 
24.3

Redemptions
(2.5
)
 
(3.1
)
Redemption value adjustments
(3.9
)
 
(1.0
)
Balance at end of period
$
155.2

 
$
188.3