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Supplemental Cash Flow Data (Tables)
 12 Months Ended
Dec. 31, 2014
Supplemental Cash Flow Data [Abstract]  
Change in Operating Capital
The change in operating capital for the three years ended December 31, 2014 was (in millions):
 
2014
 
2013
 
2012
(Increase) decrease in accounts receivable
$
(227.1
)
 
$
244.8

 
$
(218.7
)
(Increase) decrease in work in process and other current assets
(24.2
)
 
(354.5
)
 
4.8

Increase (decrease) in accounts payable
161.8

 
143.5

 
127.8

Increase (decrease) in customer advances and other current liabilities
45.5

 
252.6

 
(151.8
)
Change in other assets and liabilities, net
(62.2
)
 
64.9

 
263.1

 
$
(106.2
)
 
$
351.3

 
$
25.2

 
 
 
 
 
 
Income taxes paid
$
610.1

 
$
472.4

 
$
321.1

 
 
 
 
 
 
Interest paid
$
188.6

 
$
192.8

 
$
165.5