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Supplemental Cash Flow Data
 6 Months Ended
Jun. 30, 2015
Supplemental Cash Flow Data [Abstract]  
Supplemental Cash Flow Data
Supplemental Cash Flow Data

The change in operating capital for the six months ended June 30, 2015 and 2014 was (in millions):
 
2015
 
2014
(Increase) decrease in accounts receivable
$
(127.2
)
 
$
175.0

(Increase) decrease in work in process and other current assets
(433.6
)
 
(215.8
)
Increase (decrease) in accounts payable
(1.5
)
 
(400.5
)
Increase (decrease) in customer advances and other current liabilities
(176.8
)
 
(389.1
)
Change in other assets and liabilities, net
(69.7
)
 
(116.5
)
 
$
(808.8
)
 
$
(946.9
)
 
 
 
 
Income taxes paid
$
330.3

 
$
345.5

Interest paid
$
92.8

 
$
100.5