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GOODWILL AND INTANGIBLE ASSETS (Tables)
 6 Months Ended
Jun. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill for the six month period ended June 30, 2013 and for the year ended December 31, 2012 are as follows:

 
June 30,
2013
 
December 31, 2012
Balance as of January 1
$
2,901.7

 
$
2,681.8

Goodwill acquired during the period
85.6

 
224.5

Adjustments to goodwill
(0.7
)
 
(4.6
)
Balance at end of period
$
2,986.6

 
$
2,901.7
Components of identifiable intangible assets
The components of identifiable intangible assets are as follows:
 
June 30, 2013
 
December 31, 2012
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Customer relationships
$
1,314.1

 
$
(514.2
)
 
$
799.9

 
$
1,296.1

 
$
(483.3
)
 
$
812.8

Patents, licenses and technology
117.2

 
(81.4
)
 
35.8

 
117.2

 
(76.2
)
 
41.0

Non-compete agreements
38.8

 
(22.4
)
 
16.4

 
32.3

 
(19.6
)
 
12.7

Trade names
131.0

 
(78.2
)
 
52.8

 
131.3

 
(73.4
)
 
57.9

Canadian licenses
701.4

 
—

 
701.4

 
743.3

 
—

 
743.3

 
$
2,302.5

 
$
(696.2
)
 
$
1,606.3

 
$
2,320.2

 
$
(652.5
)
 
$
1,667.7