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Research and Development Costs (Tables)
 12 Months Ended
Dec. 31, 2012
Research and Development [Abstract]  
Schedule of Research and Development Costs
 
 Year Ended December 31,
(millions of dollars)
2012
 
2011
 
2010
Gross R&D expenditures
$
309.3

 
$
294.7

 
$
233.2

Customer reimbursements
(43.4
)
 
(51.0
)
 
(48.2
)
Net R&D expenditures
$
265.9

 
$
243.7

 
$
185.0