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Research and Development (Tables)
9 Months Ended
Sep. 30, 2011
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)
2011
 
2010
 
2011
 
2010
Gross R&D expenditures
$
69.5

 
$
60.5

 
$
214.7

 
$
168.9

Customer reimbursements
(11.1
)
 
(14.7
)
 
(30.6
)
 
(34.7
)
Net R&D expenditures
$
58.4

 
$
45.8

 
$
184.1

 
$
134.2