Business Combinations (Narrative) (Details) (USD $) In Millions, unless otherwise specified		6 Months Ended
	Apr. 30, 2011 ATC International [Member]	Dec. 31, 2011 American University Of Caribbean [Member]	Aug. 03, 2011 American University Of Caribbean [Member]	Aug. 03, 2011 American University Of The Caribbean And Medical Education Services [Member]	Aug. 03, 2011 AUC Title IV Eligibility And Accreditations [Member] American University Of Caribbean [Member]	Aug. 03, 2011 Trade Names [Member] American University Of Caribbean [Member]
Business Acquisition [Line Items]
Cash paid in exchange for the business assets acquired	$ 4.8			$ 226.0
Expected additional earn-out payment for business	4.3
Number of students		1,200
Number of graduates licensed and practicing medicine		4,000
Number of states in which graduates eligible to practice		50
Acquired intangible assets			$ 131.4		$ 100.0	$ 17.1