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Acquisitions Redeemable Noncontrolling Interest (Tables)
 12 Months Ended
Dec. 31, 2018
Business Combinations [Abstract]  
Redeemable Noncontrolling Interest
The following table presents changes in our redeemable noncontrolling interests.
 
Years ended December 31,
 
2018
 
2017
 
2016
Balance at beginning of period
$
252.1

 
$
252.8

 
$
251.9

Change in related noncontrolling interests balance
(10.7
)
 
(2.8
)
 
4.9

Changes in redemption value of redeemable noncontrolling interests:
 
 
 
 
 
Additions
—

 
7.7

 
6.8

Redemptions and other
(33.7
)
 
(18.5
)
 
(14.8
)
Redemption value adjustments
(39.8
)
 
12.9

 
4.0

Balance at end of period
$
167.9

 
$
252.1

 
$
252.8

.