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Acquisitions Acquisitions (Tables)
 3 Months Ended
Mar. 31, 2019
Business Combinations [Abstract]  
Redeemable Noncontrolling Interest [Table Text Block]
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