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Commitments and Contingent Liabilities (Narrative) (Details)
$ in Millions, $ in Millions
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Nov. 30, 2015
CAD ($)
Jun. 19, 2015
CAD ($)
Sep. 13, 2013
CAD ($)
Oct. 26, 2010
CAD ($)
Long-term Purchase Commitment [Line Items]              
Unavailable broadcast rights payable, fair value $ 15.2            
Maximum lease guarantee obligation 12.0            
TIR vs. Canadian Prime Minister of National Revenue | Pending litigation | Time, Inc.              
Long-term Purchase Commitment [Line Items]              
Loss contingency, estimate of possible loss       $ 91.0 $ 89.8 $ 26.9 $ 52.0
Discontinued operations, disposed of by sale | Performance guarantee | Time Inc. (UK) Ltd              
Long-term Purchase Commitment [Line Items]              
Guarantee obligations, current carrying amount     $ 8.0        
Discontinued operations, disposed of by sale | Performance guarantee | Sunset and INVNT Lease Guarantees              
Long-term Purchase Commitment [Line Items]              
Guarantee obligations, current carrying amount 2.0 $ 2.2          
Broadcast rights payable              
Long-term Purchase Commitment [Line Items]              
Total unavailable rights $ 16.3