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Supplemental Cash Flow Data (Tables)
 3 Months Ended
Mar. 31, 2016
Supplemental Cash Flow Data [Abstract]  
Change in Operating Capital
The change in operating capital for the three months ended March 31, 2016 and 2015 was (in millions):
 
2016
 
2015
(Increase) decrease in accounts receivable
$
1,019.0

 
$
467.3

(Increase) decrease in work in process and other current assets
(329.7
)
 
(336.8
)
Increase (decrease) in accounts payable
(1,551.7
)
 
(697.8
)
Increase (decrease) in customer advances and other current liabilities
(23.9
)
 
26.1

Change in other assets and liabilities, net
79.2

 
(18.3
)
Cash used for operating capital
$
(807.1
)
 
$
(559.5
)
 
 
 
 
Income taxes paid
$
135.5

 
$
144.3

Interest paid
$
41.5

 
$
35.2