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Revenue from Contracts with Customers (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2020
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]          
Deferred revenue recognized in period related to beginning balance     $ 278.6    
Provider Relief Fund [Member] | Graham Healthcare Group [Member] | CARES Act relief from COVID-19 [Member]          
Disaggregation of Revenue [Line Items]          
Government Relief, CARES Act   $ 7.4      
Amount of Revenue Recognized From Provider Relief Fund       $ 5.7  
Medicare Accelerated Advanced Payment Program Relief Fund [Member] | Graham Healthcare Group [Member] | CARES Act relief from COVID-19 [Member]          
Disaggregation of Revenue [Line Items]          
Government Relief, CARES Act $ 31.5        
Amount of Revenue Recognized From Government Relief, CARES Act     $ 18.9    
Transferred over Time [Member]          
Disaggregation of Revenue [Line Items]          
Percentage of Revenue     67.00% 73.00% 73.00%
Transferred at Point in Time [Member]          
Disaggregation of Revenue [Line Items]          
Percentage of Revenue     33.00% 27.00% 27.00%
U.S. [Member]          
Disaggregation of Revenue [Line Items]          
Percentage of Revenue     78.00% 78.00% 76.00%
Non U.S. [Member]          
Disaggregation of Revenue [Line Items]          
Percentage of Revenue     22.00% 22.00% 24.00%
Kaplan International [Member]          
Disaggregation of Revenue [Line Items]          
Contract with Customer, Asset, Net, Noncurrent     $ 17.7 $ 8.7  
Supplemental Education [Member] | Long-term Contract with Customer [Member]          
Disaggregation of Revenue [Line Items]          
Minimum Term of Contract     12 months    
Revenue Remaining Performance Obligation Percentage of Revenue Expected to be Recognized Over Next 12 Months     72.00%