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Acquisitions Redeemable Noncontrolling Interest (Tables)
 12 Months Ended
Dec. 31, 2016
Business Combinations [Abstract]  
Redeemable Noncontrolling Interest
The following table presents changes in our redeemable noncontrolling interests.
 
Years ended December 31,
 
2016
 
2015
 
2014
Balance at beginning of period
$
251.9

 
$
257.4

 
$
249.1

Change in related noncontrolling interest balance
4.9

 
0.8

 
3.2

Changes in redemption value of redeemable noncontrolling interests:
 
 
 
 
 
Additions
6.8

 
16.5

 
18.7

Redemptions and reclassifications
(14.8
)
 
(25.1
)
 
(7.9
)
Redemption value adjustments
4.0

 
2.3

 
(5.7
)
Balance at end of period
$
252.8

 
$
251.9

 
$
257.4