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Research and Development (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
(millions of dollars)
2012
 
2011
 
2012
 
2011
Gross R&D expenditures
$
76.7

 
$
76.1

 
$
152.9

 
$
145.2

Customer reimbursements
(10.1
)
 
(11.4
)
 
(18.6
)
 
(19.5
)
Net R&D expenditures
$
66.6

 
$
64.7

 
$
134.3

 
$
125.7