Income Taxes (Components of Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Accrued expenses not currently deductible	$ 203.0	$ 228.9
Stock-based compensation expense	33.8	45.3
Foreign Tax Credits	20.1	25.1
Net operating losses	52.0	54.0
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	46.0	5.6
Other	25.9	20.2
Deferred Tax Assets, Gross	380.8	379.1
Valuation Allowance	(12.0)	(31.6)
Deferred Tax Assets, Net of Valuation Allowance	368.8	347.5
Deferred Revenue	475.0	475.9
Fixed and intangible assets	288.2	279.5
Prepaid expenses	82.3	86.2
Tax on unrepatriated earnings	22.2	31.6
Other	6.4	7.2
Deferred Tax Liabilities	693.2	595.9
Deferred Tax Liabilities, Gross	1,062.0	943.4
Deferred Tax Liabilities, Other Comprehensive Income	$ 187.9	$ 63.0