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Affiliate Equity (Tables)
 3 Months Ended
Mar. 31, 2015
Affiliate Equity [Abstract]  
Summary of Affiliate Equity Compensation
A summary of Affiliate equity expense is as follows:
 
For the Three Months Ended March 31,
 
2014
 
2015
Affiliate equity expense
$
14.8

 
$
9.3

Tax benefit
2.9
 
1.5
Schedule of Changes in Redeemable Non-Controlling Interests
The following table presents the changes in Redeemable non-controlling interests during the period:
 
Redeemable Non-controlling Interests
Balance, as of December 31, 2014
$
645.5

Transactions in Redeemable non-controlling interests
(12.2
)
Changes in redemption value
109.9

Balance, as of March 31, 2015
$
743.2
Schedule of Changes in the Company's Interest in its Affiliates on the Controlling Interest's Equity
The following schedule discloses the effect of changes in the Company's ownership interest in its Affiliates on the controlling interest's equity:
 
For the Three Months Ended March 31,
 
2014
 
2015
Net income (controlling interest)
$
77.2

 
$
128.0

Increase (decrease) in controlling interest paid-in capital from purchases and sales of Affiliate equity
(16.3
)
 
(3.0
)
Change from Net income (controlling interest) and net transfers with non-controlling interests
$
60.9

 
$
125.0