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Computer Software (Tables)
 12 Months Ended
Dec. 31, 2014
Research and Development [Abstract]  
Schedule of Intangible Assets
Intangible assets as of December 31, 2014 consist of the following (in millions):
 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships
$
2,761.7

 
$
(1,600.5
)
 
$
1,161.2

Trademarks
122.8

 
(16.0
)
 
106.8

 
$
2,884.5

 
$
(1,616.5
)
 
$
1,268.0


Intangible assets as of December 31, 2013 consist of the following (in millions):

 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships
$
2,688.8

 
$
(1,455.1
)
 
$
1,233.7

Trademarks
118.8

 
(13.2
)
 
105.6

 
$
2,807.6

 
$
(1,468.3
)
 
$
1,339.3

Computer software as of December 31, 2014 and 2013 consists of the following (in millions):
 
2014
 
2013
Software from business acquisitions
$
519.2

 
$
535.6

Capitalized software development costs
953.1

 
847.6

Purchased software
120.3

 
174.3

Computer software
1,592.6

 
1,557.5

Accumulated amortization
(699.2
)
 
(701.0
)
Computer software, net of accumulated amortization
$
893.4

 
$
856.5