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Research and Development (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
(millions of dollars)
2012
 
2011
Gross R&D expenditures
$
76.2

 
$
69.1

Customer reimbursements
(8.5
)
 
(8.1
)
Net R&D expenditures
$
67.7

 
$
61.0