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Supplemental Cash Flow Data (Tables)
 6 Months Ended
Jun. 30, 2019
Supplemental Cash Flow Data [Abstract]  
Use of operating capital
The use of operating capital for the six months ended June 30, 2019 and 2018 was (in millions):
 
2019
 
2018
(Increase) decrease in accounts receivable
$
419.2

 
$
1,173.6

(Increase) decrease in work in process and other current assets
(305.0
)
 
(354.4
)
Increase (decrease) in accounts payable
(1,044.9
)
 
(1,803.2
)
Increase (decrease) in customer advances, taxes payable and other current liabilities
(396.2
)
 
(459.3
)
Change in other assets and liabilities, net
20.3

 
11.5

 
$
(1,306.6
)
 
$
(1,431.8
)
 
 
 
 
Income taxes paid
$
241.9

 
$
276.4

Interest paid
$
119.8

 
$
115.4