The Company periodically issues Affiliate equity interests to and repurchases Affiliate equity interests from its Affiliate partners. In these transactions, if the equity is issued for consideration below the fair value of the equity or repurchased for consideration above the fair value of the equity, then such difference is recorded as compensation expense over the requisite service period. The Company recognized compensation expense related to Affiliate equity of $5.2 million ($3.5 million attributable to the controlling interest) for the three months ended March 31, 2011 as compared to $6.3 million ($2.2 million attributable to the controlling interest) for the three months ended March 31, 2012.

Many of the Company's operating agreements provide the Company a conditional right to call and Affiliate partners the conditional right to put their retained equity interests at certain intervals. The purchase price of these conditional purchases are generally calculated based upon a multiple of the Affiliate's cash flow distributions, which is intended to represent fair value. Affiliate management partners are also permitted to sell their equity interests to other individuals or entities in certain cases, subject to the Company's approval or other restrictions. The Company, at its option, may pay for Affiliate equity purchases in cash, shares of its common stock or other forms of consideration and can consent to the transfer of these interests to other individuals or entities.

The current redemption value of these interests has been presented as Redeemable non-controlling interests on the Company's Consolidated Balance Sheets. Changes in the current redemption value are recorded to Additional paid-in capital. The following table presents the changes in Redeemable non-controlling interests during the period:


Balance as of January 1, 2012	$	451.8
Issuance of Redeemable non-controlling interest		7.0
Repurchase of Redeemable non-controlling interest		(11.2	)
Changes in redemption value		62.0

Balance as of March 31, 2012	$	509.6

During the three months ended March 31, 2011 and 2012, the Company acquired interests from and transferred interests to Affiliate management partners. 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,

	2011		2012
Net income (controlling interest)	$	39.1	$	37.4
Increase (decrease) in controlling interest paid-in capital from purchases and sales of Affiliate equity		3.8		(6.0	)

Change from Net income (controlling interest) and net transfers with non-controlling interests	$	42.9	$	31.4