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Supplemental Cash Flow (Tables)
 6 Months Ended
Jun. 30, 2013
Supplemental Cash Flow [Abstract]  
Changes in Operating Capital
Change in operating capital for the six months ended June 30, 2013 and 2012 were (in millions):
 
2013
 
2012
 
 
 
 
 
 
 
 
(Increase) decrease in accounts receivable
$
134.4

 
$
570.6

(Increase) decrease in work in process and other current assets
(323.7
)
 
(221.3
)
Increase (decrease) in accounts payable
(298.6
)
 
(571.8
)
Increase (decrease) in customer advances and other current liabilities
(94.4
)
 
(319.1
)
Change in other assets and liabilities, net
(53.4
)
 
34.8

 
 
 
 
 
 
 
 
 
$
(635.7
)
 
$
(506.8
)
 
 
 
 
 
 
 
 
Income taxes paid
$
277.1

 
$
237.0

 
 
 
 
Interest paid
$
96.3

 
$
75.1