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Supplemental Cash Flow Data (Tables)
 9 Months Ended
Sep. 30, 2017
Supplemental Cash Flow Data [Abstract]  
Increase (Decrease) in Operating Capital
The decrease in operating capital for the nine months ended September 30, 2017 and 2016 was (in millions):
 
2017
 
2016
(Increase) decrease in accounts receivable
$
645.3

 
$
818.1

(Increase) decrease in work in process and other current assets
(280.9
)
 
(212.3
)
Increase (decrease) in accounts payable
(1,310.8
)
 
(1,105.9
)
Increase (decrease) in customer advances and other current liabilities
(367.9
)
 
(293.7
)
Change in other assets and liabilities, net
(13.0
)
 
(4.9
)
 
$
(1,327.3
)
 
$
(798.7
)
 
 
 
 
Income taxes paid
$
398.0

 
$
427.6

Interest paid
$
168.6

 
$
158.5