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Supplemental Cash Flow Data
 3 Months Ended
Mar. 31, 2015
Supplemental Cash Flow Data [Abstract]  
Supplemental Cash Flow Data
Supplemental Cash Flow Data

The change in operating capital for the three months ended March 31, 2015 and 2014 was (in millions):
 
2015
 
2014
(Increase) decrease in accounts receivable
$
467.3

 
$
627.4

(Increase) decrease in work in process and other current assets
(332.1
)
 
(188.5
)
Increase (decrease) in accounts payable
(697.8
)
 
(993.1
)
Increase (decrease) in customer advances and other current liabilities
26.1

 
(51.4
)
Change in other assets and liabilities, net
(23.0
)
 
(136.7
)
 
$
(559.5
)
 
$
(742.3
)
 
 
 
 
Income taxes paid
$
144.3

 
$
165.9

Interest paid
$
35.2

 
$
41.6