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Research and Development (Tables)
 9 Months Ended
Sep. 30, 2012
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)
2012
 
2011
 
2012
 
2011
Gross R&D expenditures
$
75.6

 
$
69.5

 
$
228.5

 
$
214.7

Customer reimbursements
(11.2
)
 
(11.1
)
 
(29.8
)
 
(30.6
)
Net R&D expenditures
$
64.4

 
$
58.4

 
$
198.7

 
$
184.1