Restructuring Accrual - Severance and Related Benefit Costs by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Amount accrued in the period	$ 12.4	$ 9.9
Total amount expected to be incurred	12.4
Operating Segments | National Media
Restructuring Cost and Reserve [Line Items]
Amount accrued in the period	4.6	8.8
Total amount expected to be incurred	4.6
Operating Segments | Local Media
Restructuring Cost and Reserve [Line Items]
Amount accrued in the period	7.2	0.7
Total amount expected to be incurred	7.2
Unallocated Corporate
Restructuring Cost and Reserve [Line Items]
Amount accrued in the period	0.6	$ 0.4
Total amount expected to be incurred	$ 0.6