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Supplemental Cash Flow Data
 12 Months Ended
Dec. 31, 2014
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, 2014 was (in millions):
 
2014
 
2013
 
2012
(Increase) decrease in accounts receivable
$
(227.1
)
 
$
244.8

 
$
(218.7
)
(Increase) decrease in work in process and other current assets
(24.2
)
 
(354.5
)
 
4.8

Increase (decrease) in accounts payable
161.8

 
143.5

 
127.8

Increase (decrease) in customer advances and other current liabilities
45.5

 
252.6

 
(151.8
)
Change in other assets and liabilities, net
(62.2
)
 
64.9

 
263.1

 
$
(106.2
)
 
$
351.3

 
$
25.2

 
 
 
 
 
 
Income taxes paid
$
610.1

 
$
472.4

 
$
321.1

 
 
 
 
 
 
Interest paid
$
188.6

 
$
192.8

 
$
165.5



In June 2014, we issued 1,217,112 shares of our common stock to satisfy the conversion premium in connection with the conversion of the 2032 Notes (see Note 7). Based on the closing prices of our common stock on the settlement dates, these issuances resulted in a non-cash pretax financing activity of $89.2 million, excluding the cash tax benefit of $32.2 million.

In May 2013, we issued 1,499,792 shares of our common stock to satisfy the conversion premium in connection with the conversion of the 2033 Notes and the 2038 Notes (see Note 7). Based on the closing prices of our common stock on the settlement dates, these issuances resulted in a non-cash pretax financing activity of $95.4 million, excluding the cash tax benefit of $34.5 million.