Restructuring Accrual - Severance and Related Benefit Costs by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Amount Accrued in the Period	$ 3.8	$ 22.8	$ 13.7	$ 35.3
Total Amount Expected to be Incurred	14.3		14.3
Operating segments | National media
Restructuring Cost and Reserve [Line Items]
Amount Accrued in the Period	0.0	17.3	8.8	23.3
Total Amount Expected to be Incurred	8.8		8.8
Operating segments | Local media
Restructuring Cost and Reserve [Line Items]
Amount Accrued in the Period	1.7	0.2	2.4	1.7
Total Amount Expected to be Incurred	2.4		2.4
Unallocated corporate
Restructuring Cost and Reserve [Line Items]
Amount Accrued in the Period	2.1	$ 5.3	2.5	$ 10.3
Total Amount Expected to be Incurred	$ 3.1		$ 3.1