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Research and Development (Tables)
 6 Months Ended
Jun. 30, 2013
Research and Development [Abstract]  
Gross and net expenditures on research and development ("R&D") activities
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(millions of dollars)
2013
 
2012
 
2013
 
2012
Gross R&D expenditures
$
84.0

 
$
76.7

 
$
166.2

 
$
152.9

Customer reimbursements
(11.4
)
 
(10.1
)
 
(21.8
)
 
(18.6
)
Net R&D expenditures
$
72.6

 
$
66.6

 
$
144.4

 
$
134.3