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Research and Development Costs (Tables)
 12 Months Ended
Dec. 31, 2011
Research and Development [Abstract]  
Schedule of Research and Development Costs
 
 Year Ended December 31,
(millions of dollars)
2011
 
2010
 
2009
Gross R&D expenditures
$
294.7

 
$
233.2

 
$
219.0

Customer reimbursements
(51.0
)
 
(48.2
)
 
(63.8
)
Net R&D expenditures
$
243.7

 
$
185.0

 
$
155.2