ACQUISITIONS (Details 2) (Accelerated Care Plus Corp. (ACP), USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Acquired intangible assets
Contingent consideration paid on acquisitions prior to adoption of new authoritative guidance	$ 0.5	$ 0.7	$ 1.3
Contingent consideration paid after adoption of new authoritative guidance	2.5	1.5	0.4
Estimated payments related to contingent consideration provisions of acquisitions in future periods	6.3
Trade Name ACP
Acquired intangible assets
Indefinite-lived intangible assets acquired			9.1
Customer relationships
Acquired intangible assets
Amortizable intangible assets acquired			22.3
Useful life of identified intangible asset (in years)			14
Proprietary treatment programs
Acquired intangible assets
Amortizable intangible assets acquired			8.1
Useful life of identified intangible asset (in years)			15
Patented technology
Acquired intangible assets
Amortizable intangible assets acquired			5.4
Useful life of identified intangible asset (in years)			8
Other definite-lived intangible assets
Acquired intangible assets
Amortizable intangible assets acquired			$ 3.3
Minimum useful life of identified intangible asset (in years)			3
Maximum useful life of identified intangible asset (in years)			5