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Supplemental Cash Flow (Tables)
 9 Months Ended
Sep. 30, 2013
Supplemental Cash Flow [Abstract]  
Changes in Operating Capital
Change in operating capital for the nine months ended September 30, 2013 and 2012 were (in millions):
 
2013
 
2012
 
 
 
 
 
 
 
 
(Increase) decrease in accounts receivable
$
294.0

 
$
438.1

(Increase) decrease in work in process and other current assets
(392.8
)
 
(205.6
)
Increase (decrease) in accounts payable
(668.9
)
 
(697.4
)
Increase (decrease) in customer advances and other current liabilities
97.6

 
(314.5
)
Change in other assets and liabilities, net
15.9

 
113.5

 
 
 
 
 
 
 
 
 
$
(654.2
)
 
$
(665.9
)
 
 
 
 
 
 
 
 
Income taxes paid
$
335.2

 
$
287.5

 
 
 
 
Interest paid
$
134.8

 
$
114.8