OMNICOM GROUP INC. | 2013 | FY | 3

Supplemental Cash Flow Data

The change in operating capital for the three years ended December 31, 2013 was (in millions):
 
2013
 
2012
 
2011
 
 
 
 
 
 
(Increase) decrease in accounts receivable
$
244.8

 
$
(218.7
)
 
$
(471.4
)
(Increase) decrease in work in process and other current assets
(354.5
)
 
4.8

 
(53.2
)
Increase (decrease) in accounts payable
143.5

 
127.8

 
262.7

Increase (decrease) in customer advances and other current liabilities
252.6

 
(151.8
)
 
(4.5
)
Change in other assets and liabilities, net
64.9

 
263.1

 
295.6

 
$
351.3

 
$
25.2

 
$
29.2

 
 
 
 
 
 
Income taxes paid
$
472.4

 
$
321.1

 
$
365.4

 
 
 
 
 
 
Interest paid
$
192.8

 
$
165.5

 
$
153.9



In connection with the conversion of our 2033 Notes and our 2038 Notes in May 2013, we issued 1,499,792 shares of our common stock to satisfy the conversion premium. Based on the closing prices of our common stock on the settlement dates, these issuances resulted in a non-cash pre-tax financing activity of $95.4 million, excluding the cash tax benefit of $34.5 million.

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