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Supplemental Cash Flow Data
12 Months Ended
Dec. 31, 2015
Supplemental Cash Flow Data [Abstract]  
Supplemental Cash Flow Data
Supplemental Cash Flow Data

The change in operating capital for the three years ended December 31, 2015 was (in millions):
 
2015
 
2014
 
2013
(Increase) decrease in accounts receivable
$
(1,063.6
)
 
$
(227.1
)
 
$
244.8

(Increase) decrease in work in process and other current assets
(74.7
)
 
(14.2
)
 
(413.9
)
Increase (decrease) in accounts payable
1,443.7

 
231.3

 
236.6

Increase (decrease) in customer advances and other current liabilities
203.9

 
(24.0
)
 
159.6

Change in other assets and liabilities, net
48.3

 
(72.2
)
 
124.2

 
$
557.6

 
$
(106.2
)
 
$
351.3

 
 
 
 
 
 
Income taxes paid
$
540.1

 
$
610.1

 
$
472.4

 
 
 
 
 
 
Interest paid
$
173.9

 
$
188.6

 
$
192.8



In 2014, as a result of the conversion of the 2032 Notes (See Note 6), we issued 1,217,112 shares of our common stock to satisfy the conversion premium. Based on the closing prices of our common stock on the settlement dates, the issuances resulted in a non-cash pretax financing activity of $89.2 million, net of the cash tax benefit of $32.2 million (See Note 10).

In 2013, as a result of the conversion of the 2033 Notes and the 2038 Notes (See Note 6), 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, the issuances resulted in a non-cash pretax financing activity of $95.4 million, net of the cash tax benefit of $34.5 million (See Note 10).