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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2013
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible assets
Intangible assets consisted of the following:
 
 
December 31, 2013
 
December 31, 2012
(in millions)
Gross
 
Accumulated
Amortization
 
Net
 
Gross
 
Accumulated
Amortization
 
Net
Database and credit files
$
761.8

 
$
(84.3
)
 
$
677.5

 
$
763.6

 
$
(33.9
)
 
$
729.7

Internal use software
510.4

 
(94.7
)
 
415.7

 
380.3

 
(34.8
)
 
345.5

Customer relationships
336.1

 
(25.8
)
 
310.3

 
306.7

 
(10.3
)
 
296.4

Trademarks, copyrights and patents
550.7

 
(22.2
)
 
528.5

 
545.5

 
(7.4
)
 
538.1

Noncompete and other agreements
2.5

 
(0.5
)
 
2.0

 
2.1

 
(0.2
)
 
1.9

Total intangible assets
$
2,161.5

 
$
(227.5
)
 
$
1,934.0

 
$
1,998.2

 
$
(86.6
)
 
$
1,911.6

Estimated future amortization expense related to purchased intangible
Estimated future amortization expense related to purchased intangible assets at December 31, 2013, is as follows:
 
(in millions)
Annual
Amortization
Expense
2014
$
155.5

2015
154.8

2016
148.7

2017
143.2

2018
141.3

Thereafter
1,190.5

Total future amortization expense
$
1,934.0