Restructuring Accrual - Severance and Related Benefit Costs by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Accruals	$ 22.6
Employee Severance
Restructuring Cost and Reserve [Line Items]
Accruals	12.5	$ 0.0
Total Amount Expected to be Incurred	15.0
Employee Severance | National media
Restructuring Cost and Reserve [Line Items]
Accruals	6.0
Total Amount Expected to be Incurred	7.0
Employee Severance | Local media
Restructuring Cost and Reserve [Line Items]
Accruals	1.5
Total Amount Expected to be Incurred	1.5
Employee Severance | Corporate
Restructuring Cost and Reserve [Line Items]
Accruals	5.0
Total Amount Expected to be Incurred	$ 6.5