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Supplemental Cash Flow Data
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Data [Abstract]  
Supplemental Cash Flow Data
Supplemental Cash Flow Data

The increase in operating capital for the three years ended December 31, 2017 was (in millions):
 
2017
 
2016
 
2015
(Increase) decrease in accounts receivable
$
(341.6
)
 
$
(376.5
)
 
$
(1,063.6
)
(Increase) decrease in work in process and other current assets
5.4

 
(89.7
)
 
(79.6
)
Increase (decrease) in accounts payable
763.2

 
741.9

 
1,443.7

Increase (decrease) in customer advances, taxes payable and other
     current liabilities
4.8

 
31.6

 
243.9

Change in other assets and liabilities, net
(83.3
)
 
(4.5
)
 
15.1

 
$
348.5

 
$
302.8

 
$
559.5

 
 
 
 
 
 
Income taxes paid
$
566.0

 
$
570.4

 
$
540.1

Interest paid
$
226.2

 
$
216.7

 
$
173.9