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Supplemental Cash Flow Data
 12 Months Ended
Dec. 31, 2016
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, 2016 was (in millions):
 
2016
 
2015
 
2014
(Increase) decrease in accounts receivable
$
(376.5
)
 
$
(1,063.6
)
 
$
(227.1
)
(Increase) decrease in work in process and other current assets
(89.7
)
 
(74.7
)
 
(14.2
)
Increase (decrease) in accounts payable
741.9

 
1,443.7

 
231.3

Increase (decrease) in customer advances and other current liabilities
36.3

 
203.9

 
(24.0
)
Change in other assets and liabilities, net
11.0

 
48.3

 
(72.2
)
 
$
323.0

 
$
557.6

 
$
(106.2
)
 
 
 
 
 
 
Income taxes paid
$
570.4

 
$
540.1

 
$
610.1

Interest paid
$
216.7

 
$
173.9

 
$
188.6



As a result of the conversion of the 2032 Notes (see Note 6), in 2014 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 a cash tax benefit of $32.2 million (see Note 10).