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GOODWILL AND INTANGIBLE ASSETS (Tables)
 3 Months Ended
Mar. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill for the three-month period ended March 31, 2012 and for the year ended December 31, 2011 are as follows:

 
March 31, 2012
 
December 31, 2011
Balance as of January 1
$
2,681.8

 
$
2,601.3

Goodwill acquired during the period
—

 
86.2

Adjustments to goodwill
(1.5
)
 
(5.7
)
Balance at end of period
$
2,680.3

 
$
2,681.8
Components of identifiable intangible assets
The components of identifiable intangible assets are as follows:

 
March 31, 2012
 
December 31, 2011
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
Customer relationships
$
1,187.7

 
$
(441.0
)
 
$
1,187.5

 
$
(426.8
)
Patents, licenses and technology
145.7

 
(91.3
)
 
144.9

 
(88.3
)
Non-compete agreements
28.0

 
(16.0
)
 
28.1

 
(14.8
)
Trade names
129.4

 
(64.3
)
 
129.2

 
(61.3
)
Canadian licenses
738.4

 
—

 
722.2

 
—

 
$
2,229.2

 
$
(612.6
)
 
$
2,211.9

 
$
(591.2
)