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Research and Development Costs (Tables)
 12 Months Ended
Dec. 31, 2013
Research and Development [Abstract]  
Schedule of Research and Development Costs
 
 Year Ended December 31,
(millions of dollars)
2013
 
2012
 
2011
Gross R&D expenditures
$
350.4

 
$
309.3

 
$
294.7

Customer reimbursements
(47.2
)
 
(43.4
)
 
(51.0
)
Net R&D expenditures
$
303.2

 
$
265.9

 
$
243.7