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Acquisitions and Dispositions (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
business
Dec. 31, 2011
business
Jan. 02, 2011
business
Nov. 30, 2012
Celtic Healthcare, Inc. [Member]
Dec. 31, 2012
Education [Member]
business
Dec. 31, 2011
Kaplan International [Member]
business
Jan. 02, 2011
Kaplan International [Member]
business
Dec. 31, 2011
Kaplan Ventures [Member]
business
Jan. 02, 2011
Kaplan Ventures [Member]
business
Jan. 02, 2011
Test Preparation [Member]
business
Dec. 31, 2011
Higher Education [Member]
business
Dec. 31, 2012
Other Businesses [Member]
business
Nov. 30, 2012
Other Businesses [Member]
Celtic Healthcare, Inc. [Member]
business
Jan. 02, 2011
Other Businesses and Cable Television [Member]
business
Business Acquisition [Line Items]                            
Cost of acquisition $ 55.6 $ 136.5 $ 14.1                      
Number of businesses acquired 5 5 6   3 3 1 1 1 2 1 1 1 2
Assumed debt   5.5                        
Fair value of the noncontrolling interest       $ 5.9