Intangible Assets and Goodwill (Goodwill) (Details) - USD ($)		12 Months Ended
	May 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Goodwill [Line Items]
Goodwill				$ 1,979,400,000	$ 1,915,800,000	$ 1,024,400,000
Accumulated impairment losses				0	0	(116,900,000)
Goodwill, net		$ 1,979,400,000	$ 907,500,000	1,979,400,000	1,915,800,000	907,500,000
Goodwill [Roll Forward]
Goodwill at beginning of period		1,915,800,000	907,500,000
Acquisitions		11,400,000	1,063,200,000
Disposals			(54,900,000)
Acquisition adjustments		52,200,000
Goodwill at end of period		1,979,400,000	1,915,800,000
MXM
Goodwill [Roll Forward]
Disposals	$ 0
Disposals			116,900,000
Goodwill decrease			171,800,000
National Media
Goodwill [Line Items]
Goodwill				1,862,800,000	1,800,000,000.0	943,800,000
Accumulated impairment losses				0	0	(116,900,000)
Goodwill, net		1,800,000,000.0	826,900,000	1,862,800,000	1,800,000,000.0	826,900,000
Goodwill [Roll Forward]
Goodwill at beginning of period		1,800,000,000.0	826,900,000
Acquisitions		10,600,000	1,028,000,000.0
Disposals			(54,900,000)
Acquisition adjustments		52,200,000
Goodwill at end of period		1,862,800,000	1,800,000,000.0
Local Media
Goodwill [Line Items]
Goodwill				116,600,000	115,800,000	80,600,000
Accumulated impairment losses				0	0	0
Goodwill, net		115,800,000	80,600,000	$ 116,600,000	$ 115,800,000	$ 80,600,000
Goodwill [Roll Forward]
Goodwill at beginning of period		115,800,000	80,600,000
Acquisitions		800,000	35,200,000
Disposals			0
Acquisition adjustments		0
Goodwill at end of period		$ 116,600,000	$ 115,800,000