GOODWILL AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill (net of accumulated amortization) for the years ended December 31, 2011 and 2010 are as follows:

	2011			2010
Balance as of January 1	$	2,601.3		$	1,897.1
Goodwill acquired during the year	86.2			704.4
Adjustments to goodwill	(5.7		)	(0.2		)
Goodwill, net	$	2,681.8		$	2,601.3

Components of identifiable intangible assets

The components of identifiable intangible assets are as follows:

	December 31, 2011					December 31, 2010
	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Customer relationships	$	1,187.5	$	(426.8	)	$	1,146.0	$	(370.0	)
Patents, licenses and technology	144.9		(88.3		)	144.7		(75.7		)
Non-compete agreements	28.1		(14.8		)	26.6		(9.4		)
Trade names	129.2		(61.3		)	123.3		(50.3		)
Canadian licenses	722.2		—			738.9		—
	$	2,211.9	$	(591.2	)	$	2,179.5	$	(505.4	)

Acquired amortizable intangible assets and their respective weighted average amortization periods

A summary of amortizable intangible assets acquired during 2011, and their respective weighted average amortization periods are as follows:

	Amount		Weighted Average Amortization Period
Customer relationships	$	41.6	13.9
Patents, licenses and technology	—		—
Non-compete agreements	1.7		5.0
Trade names	6.0		9.8
	$	49.3	13.4