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Supplemental Cash Flow Data (Tables)
 6 Months Ended
Jun. 30, 2014
Supplemental Cash Flow Data [Abstract]  
Change in Operating Capital
The change in operating capital for the six months ended June 30, 2014 and 2013 was (in millions):
 
2014
 
2013
(Increase) decrease in accounts receivable
$
175.0

 
$
134.4

(Increase) decrease in work in process and other current assets
(215.8
)
 
(323.7
)
Increase (decrease) in accounts payable
(378.8
)
 
(298.6
)
Increase (decrease) in customer advances and other current liabilities
(410.8
)
 
(94.4
)
Change in other assets and liabilities, net
(116.5
)
 
(53.4
)
 
$
(946.9
)
 
$
(635.7
)
 
 
 
 
Income taxes paid
$
345.5

 
$
277.1

Interest paid
$
100.5

 
$
96.3