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Research and Development Expenditures (Tables)
 9 Months Ended
Sep. 30, 2015
Research and Development [Abstract]  
Gross and net expenditures on research and development ("R&D") activities
The following table presents the Company’s gross and net expenditures on R&D activities:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(in millions)
2015
 
2014
 
2015
 
2014
Gross R&D expenditures
$
95.6

 
$
96.1

 
$
282.2

 
$
292.1

Customer reimbursements
(20.4
)
 
(10.8
)
 
(51.5
)
 
(34.7
)
Net R&D expenditures
$
75.2

 
$
85.3

 
$
230.7

 
$
257.4