Fair Value Measurements (Schedule of Changes in Fair Value of Level 3 Inputs) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Fair Value Liabilities [Roll Forward]
Liabilities associated with assets held-for-sale	$ 252.1	$ 200.0
Level 3 | Measured at fair value on recurring basis | Investment in Next Issue Media
Fair Value Assets [Roll Forward]
Balance at beginning of year	0.0	11.0
Additions due to investment and acquisition	0.0	3.3
Equity method investment losses	0.0	(3.6)
Impairment	0.0	(9.3)
Sale	0.0	(1.4)
Balance at end of year	0.0	0.0
Level 3 | Measured at fair value on recurring basis | Contingent consideration
Fair Value Liabilities [Roll Forward]
Balance at beginning of year	0.8	25.4	$ 34.2
Accrual on Time’s opening balance sheet	0.0	1.1
Payments	(19.3)	(5.1)
Fair value adjustment	(5.3)	(4.8)
Balance at end of year	0.8	25.4	34.2
Liabilities associated with assets held-for-sale			0.5
Level 3 | Measured at fair value on recurring basis | 2019 Lease Guarantee
Fair Value Liabilities [Roll Forward]
Balance at beginning of year	0.0	0.0
Accrual on Time’s opening balance sheet	0.0
Issuance of new guarantees	0.0
Fair value adjustment	0.0
Foreign currency exchange impact	0.0
Balance at end of year	0.0	0.0
Level 3 | Measured at fair value on recurring basis | 2018 Lease Guarantee
Fair Value Liabilities [Roll Forward]
Balance at beginning of year		11.9	0.0
Accrual on Time’s opening balance sheet		3.6
Issuance of new guarantees		9.2
Fair value adjustment		(0.4)
Foreign currency exchange impact		(0.5)
Balance at end of year		11.9	$ 0.0
Level 3 | Measured at fair value on nonrecurring basis | Trademarks
Fair Value Assets [Roll Forward]
Balance at beginning of year	33.0
Balance at end of year	27.2	33.0
Level 3 | Measured at fair value on nonrecurring basis | 2019 Trademarks
Fair Value Assets [Roll Forward]
Balance at beginning of year	69.0
Impairment	(41.8)
Balance at end of year	27.2	69.0
Level 3 | Measured at fair value on nonrecurring basis | 2018 Trademarks
Fair Value Assets [Roll Forward]
Balance at beginning of year	$ 33.0	55.7
Impairment		(22.7)
Balance at end of year		$ 33.0