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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill
The changes in the carrying amount of goodwill for the three months ended March 31, 2013 are as follows (in millions):

    
 
 
Public Safety & Security
 
Government Solutions
 
Total
 
 
 
 
 
 
 
 
 
Balance as of December 30, 2012
 
$
35.6

 
$
560.9

 
$
596.5

 
Retrospective adjustments
 
—

 
(0.1
)
 
(0.1
)
 
Balance as of December 30, 2012 after retrospective adjustments
 
$
35.6

 
$
560.8

 
$
596.4

 
Schedule of acquired finite-lived intangible assets
The following table sets forth information for finite-lived intangible assets subject to amortization (in millions):
 
 
As of December 30, 2012
 
As of March 31, 2013
 
Gross
Value
 
Accumulated
Amortization
 
Net
Value
 
Gross
Value
 
Accumulated
Amortization
 
Net
Value
Acquired finite-lived intangible assets:
 

 
 

 
 

 
 

 
 

 
 

Customer relationships
$
97.7

 
$
(36.2
)
 
$
61.5

 
$
97.7

 
$
(40.1
)
 
$
57.6

Contracts and backlog
80.0

 
(64.3
)
 
15.7

 
80.0

 
(68.6
)
 
11.4

Developed technology and technical know-how
22.1

 
(6.4
)
 
15.7

 
22.1

 
(6.9
)
 
15.2

Trade names
6.1

 
(1.2
)
 
4.9

 
6.1

 
(1.7
)
 
4.4

Favorable operating lease
1.8

 
(0.4
)
 
1.4

 
1.8

 
(0.5
)
 
1.3

Total
$
207.7

 
$
(108.5
)
 
$
99.2

 
$
207.7

 
$
(117.8
)
 
$
89.9