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Supplemental Cash Flow Data
 3 Months Ended
Mar. 31, 2018
Supplemental Cash Flow Data [Abstract]  
Supplemental Cash Flow Data
Supplemental Cash Flow Data
The use of operating capital for the three months ended March 31, 2018 and 2017 was (in millions):
 
2018
 
2017
(Increase) decrease in accounts receivable
$
973.2

 
$
779.5

(Increase) decrease in work in process and other current assets
(271.9
)
 
(213.5
)
Increase (decrease) in accounts payable
(1,522.1
)
 
(1,117.6
)
Increase (decrease) in customer advances and other current liabilities
(181.3
)
 
39.9

Change in other assets and liabilities, net
6.0

 
(38.9
)
 
$
(996.1
)
 
$
(550.6
)
 
 
 
 
Income taxes paid
$
83.2

 
$
64.8

Interest paid
$
55.8

 
$
53.2