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Employee Benefit Plans - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Nov. 09, 2018
USD ($)
retiree
SERPs        
Defined Benefit Plan Disclosure [Line Items]        
Contributions to benefit plan     $ 5.8  
Estimated future contributions   $ 0.7 0.7  
Settlement charge recognized   2.0    
Defined benefit plans        
Defined Benefit Plan Disclosure [Line Items]        
Contributions to benefit plan     13.7  
Estimated future contributions   $ 3.5 $ 3.5  
Minimum | Scenario, Forecast        
Defined Benefit Plan Disclosure [Line Items]        
Non-cash settlement charge $ 10.0      
Maximum | Scenario, Forecast        
Defined Benefit Plan Disclosure [Line Items]        
Non-cash settlement charge $ 12.0      
Subsequent Event | Journal Communications, Inc. Plan | Defined benefit plans        
Defined Benefit Plan Disclosure [Line Items]        
Pension assets       $ 306.0
Pension obligations       419.0
Premium group annuity contract       $ 53.5
Number of eligible employees | retiree       1,500
Subsequent Event | Scripps Pension Plan | Defined benefit plans        
Defined Benefit Plan Disclosure [Line Items]        
Pension assets       $ 9.0
Pension obligations       $ 9.0
Number of eligible employees | retiree       600