Restructuring Accruals (Severance and Related Benefit Costs by Segment) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Amount Accrued in the Period	$ 14.6	$ 18.1
Total Amount Expected to be Incurred	14.6
Operating segments | National media
Restructuring Cost and Reserve [Line Items]
Amount Accrued in the Period	6.7	12.4
Total Amount Expected to be Incurred	6.7
Operating segments | Local media
Restructuring Cost and Reserve [Line Items]
Amount Accrued in the Period	7.3	2.4
Total Amount Expected to be Incurred	7.3
Unallocated corporate
Restructuring Cost and Reserve [Line Items]
Amount Accrued in the Period	0.6	$ 3.3
Total Amount Expected to be Incurred	$ 0.6