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Supplemental Cash Flow Data (Tables)
 9 Months Ended
Sep. 30, 2015
Supplemental Cash Flow Data [Abstract]  
Change in Operating Capital
The change in operating capital for the nine months ended September 30, 2015 and 2014 was (in millions):
 
2015
 
2014
(Increase) decrease in accounts receivable
$
(67.4
)
 
$
333.4

(Increase) decrease in work in process and other current assets
(367.0
)
 
(333.5
)
Increase (decrease) in accounts payable
(132.2
)
 
(724.2
)
Increase (decrease) in customer advances and other current liabilities
(68.1
)
 
(252.1
)
Change in other assets and liabilities, net
(36.1
)
 
(115.5
)
 
$
(670.8
)
 
$
(1,091.9
)
 
 
 
 
Income taxes paid
$
402.4

 
$
420.9

Interest paid
$
125.3

 
$
147.1