Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Income Tax Examination [Line Items]
Income tax expense (benefit)	$ 28.7		$ (43.6)	$ 83.6	$ (15.4)
National Media
Income Tax Examination [Line Items]
Income tax expense (benefit)			(26.9)
Impairment			$ 252.7		$ 252.7
Domestic Tax Authority
Income Tax Examination [Line Items]
Income tax expense (benefit)		$ (15.2)