Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 785.6	$ 750.1	$ 878.4	$ 774.4	$ 798.7	$ 655.0	$ 417.7	$ 392.8	$ 3,188.5	$ 2,264.2	$ 1,713.3
Advertising related
Disaggregation of Revenue [Line Items]
Total revenues									1,686.6	1,190.7	934.1
Print
Disaggregation of Revenue [Line Items]
Total revenues									690.1
Non-political spot
Disaggregation of Revenue [Line Items]
Total revenues									323.3
Political spot
Disaggregation of Revenue [Line Items]
Total revenues									102.9
Digital
Disaggregation of Revenue [Line Items]
Total revenues									410.7
Third party sales
Disaggregation of Revenue [Line Items]
Total revenues									159.6
Consumer related
Disaggregation of Revenue [Line Items]
Total revenues			358.3	316.1					1,393.6	921.3	613.5
Subscription
Disaggregation of Revenue [Line Items]
Total revenues									693.7
Retransmission
Disaggregation of Revenue [Line Items]
Total revenues									316.5
Newsstand
Disaggregation of Revenue [Line Items]
Total revenues									165.5
Affinity marketing
Disaggregation of Revenue [Line Items]
Total revenues									83.6
Licensing
Disaggregation of Revenue [Line Items]
Total revenues									94.4
Digital consumer driven
Disaggregation of Revenue [Line Items]
Total revenues									39.9
Other
Disaggregation of Revenue [Line Items]
Total revenues									108.3	152.2	165.7
Projects based
Disaggregation of Revenue [Line Items]
Total revenues									50.5
Other
Disaggregation of Revenue [Line Items]
Total revenues									57.8
Operating segments
Disaggregation of Revenue [Line Items]
Total revenues									3,190.4	2,265.7	1,713.3
Operating segments | National Media
Disaggregation of Revenue [Line Items]
Total revenues	587.5	562.3	616.2	560.6	600.6	485.6	247.4	239.0	2,326.6	1,572.6	1,083.2
Operating segments | National Media | Advertising related
Disaggregation of Revenue [Line Items]
Total revenues									1,150.3
Operating segments | National Media | Print
Disaggregation of Revenue [Line Items]
Total revenues									690.1
Operating segments | National Media | Non-political spot
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Operating segments | National Media | Political spot
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Operating segments | National Media | Digital
Disaggregation of Revenue [Line Items]
Total revenues									394.9
Operating segments | National Media | Third party sales
Disaggregation of Revenue [Line Items]
Total revenues									65.3
Operating segments | National Media | Consumer related
Disaggregation of Revenue [Line Items]
Total revenues									1,077.1
Operating segments | National Media | Subscription
Disaggregation of Revenue [Line Items]
Total revenues									693.7
Operating segments | National Media | Retransmission
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Operating segments | National Media | Newsstand
Disaggregation of Revenue [Line Items]
Total revenues									165.5
Operating segments | National Media | Affinity marketing
Disaggregation of Revenue [Line Items]
Total revenues									83.6
Operating segments | National Media | Licensing
Disaggregation of Revenue [Line Items]
Total revenues									94.4
Operating segments | National Media | Digital consumer driven
Disaggregation of Revenue [Line Items]
Total revenues									39.9
Operating segments | National Media | Other
Disaggregation of Revenue [Line Items]
Total revenues									99.2
Operating segments | National Media | Projects based
Disaggregation of Revenue [Line Items]
Total revenues									50.5
Operating segments | National Media | Other
Disaggregation of Revenue [Line Items]
Total revenues									48.7
Operating segments | Local Media
Disaggregation of Revenue [Line Items]
Total revenues	198.6	188.4	262.4	214.4	198.9	170.1	170.3	153.8	863.8	693.1	630.1
Operating segments | Local Media | Advertising related
Disaggregation of Revenue [Line Items]
Total revenues									538.2
Operating segments | Local Media | Print
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Operating segments | Local Media | Non-political spot
Disaggregation of Revenue [Line Items]
Total revenues									323.3
Operating segments | Local Media | Political spot
Disaggregation of Revenue [Line Items]
Total revenues									102.9
Operating segments | Local Media | Digital
Disaggregation of Revenue [Line Items]
Total revenues									15.8
Operating segments | Local Media | Third party sales
Disaggregation of Revenue [Line Items]
Total revenues									96.2
Operating segments | Local Media | Consumer related
Disaggregation of Revenue [Line Items]
Total revenues									316.5
Operating segments | Local Media | Subscription
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Operating segments | Local Media | Retransmission
Disaggregation of Revenue [Line Items]
Total revenues									316.5
Operating segments | Local Media | Newsstand
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Operating segments | Local Media | Affinity marketing
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Operating segments | Local Media | Licensing
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Operating segments | Local Media | Digital consumer driven
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Operating segments | Local Media | Other
Disaggregation of Revenue [Line Items]
Total revenues									9.1
Operating segments | Local Media | Projects based
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Operating segments | Local Media | Other
Disaggregation of Revenue [Line Items]
Total revenues									9.1
Intersegment Elimination
Disaggregation of Revenue [Line Items]
Total revenues	$ (0.5)	$ (0.6)	$ (0.2)	$ (0.6)	$ (0.8)	$ (0.7)	$ 0.0	$ 0.0	(1.9)	$ (1.5)	$ 0.0
Intersegment Elimination | Advertising related
Disaggregation of Revenue [Line Items]
Total revenues									(1.9)
Intersegment Elimination | Print
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Non-political spot
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Political spot
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Digital
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Third party sales
Disaggregation of Revenue [Line Items]
Total revenues									(1.9)
Intersegment Elimination | Consumer related
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Subscription
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Retransmission
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Newsstand
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Affinity marketing
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Licensing
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Digital consumer driven
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Other
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Projects based
Disaggregation of Revenue [Line Items]
Total revenues									0.0
Intersegment Elimination | Other
Disaggregation of Revenue [Line Items]
Total revenues									$ 0.0