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Supplemental Cash Flow Data (Tables)
 12 Months Ended
Dec. 31, 2015
Supplemental Cash Flow Data [Abstract]  
Change in Operating Capital
The change in operating capital for the three years ended December 31, 2015 was (in millions):
 
2015
 
2014
 
2013
(Increase) decrease in accounts receivable
$
(1,063.6
)
 
$
(227.1
)
 
$
244.8

(Increase) decrease in work in process and other current assets
(74.7
)
 
(14.2
)
 
(413.9
)
Increase (decrease) in accounts payable
1,443.7

 
231.3

 
236.6

Increase (decrease) in customer advances and other current liabilities
203.9

 
(24.0
)
 
159.6

Change in other assets and liabilities, net
48.3

 
(72.2
)
 
124.2

 
$
557.6

 
$
(106.2
)
 
$
351.3

 
 
 
 
 
 
Income taxes paid
$
540.1

 
$
610.1

 
$
472.4

 
 
 
 
 
 
Interest paid
$
173.9

 
$
188.6

 
$
192.8