Restructuring Accrual - Narrative (Details) $ in Millions	3 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($) employee	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Acquisition, disposition, and restructuring related activities	$ 14.1	$ 14.1
Loss from discontinued operations, net of income taxes	0.0	(6.0)
Restructuring liability	17.1
Restructuring liability, current portion	16.0
Restructuring liability, noncurrent portion	1.1
2020 Performance Improvement Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		12.9
Acquisition, disposition, and restructuring related activities		9.2
Loss from discontinued operations, net of income taxes		$ 3.7
2020 Performance Improvement Restructuring Plan | Unallocated Corporate
Restructuring Cost and Reserve [Line Items]
Number of employees affected | employee		10
National Media | 2020 Performance Improvement Restructuring Plan | Operating Segments
Restructuring Cost and Reserve [Line Items]
Number of employees affected | employee		130
Local Media | 2020 Performance Improvement Restructuring Plan | Operating Segments
Restructuring Cost and Reserve [Line Items]
Number of employees affected | employee		10
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring liability	$ 17.1	$ 34.3	$ 10.7	$ 43.7
Employee Severance | 2021 Performance Improvement Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 12.4
Employee Severance | 2021 Performance Improvement Restructuring Plan | Unallocated Corporate
Restructuring Cost and Reserve [Line Items]
Number of employees affected | employee		10
Employee Severance | 2020 Performance Improvement Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 9.9
Employee Severance | National Media | 2021 Performance Improvement Restructuring Plan | Operating Segments
Restructuring Cost and Reserve [Line Items]
Number of employees affected | employee		80
Employee Severance | Local Media | 2021 Performance Improvement Restructuring Plan | Operating Segments
Restructuring Cost and Reserve [Line Items]
Number of employees affected | employee		140
Other Costs and Expenses | 2020 Performance Improvement Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 3.0