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Research and Development (Tables)
 3 Months Ended
Mar. 31, 2013
Research and Development [Abstract]  
Gross and net expenditures on research and development ("R&D") activities
 
Three Months Ended
March 31,
(millions of dollars)
2013
 
2012
Gross R&D expenditures
$
82.2

 
$
76.2

Customer reimbursements
(10.4
)
 
(8.5
)
Net R&D expenditures
$
71.8

 
$
67.7