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Research and Development Expenditures (Tables)
 9 Months Ended
Sep. 30, 2014
Research and Development [Abstract]  
Gross and net expenditures on research and development ("R&D") activities
The following table presents the Company’s gross and net expenditures on R&D activities:

 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(millions of dollars)
2014
 
2013
 
2014
 
2013
Gross R&D expenditures
$
96.1

 
$
84.7

 
$
292.1

 
$
250.9

Customer reimbursements
(10.8
)
 
(12.9
)
 
(34.7
)
 
(34.7
)
Net R&D expenditures
$
85.3

 
$
71.8

 
$
257.4

 
$
216.2