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Research and Development Expenditures (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
(millions of dollars)
2014
 
2013
Gross R&D expenditures
$
94.5

 
$
82.2

Customer reimbursements
(12.5
)
 
(10.4
)
Net R&D expenditures
$
82.0

 
$
71.8