Revenue Contract Balances (Details) - USD ($) $ in Millions	6 Months Ended
	Dec. 31, 2019	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Accounts receivable (including unbilled receivables)	$ 320.9	$ 290.4
Short-term contract assets (included in other current assets)	30.3	29.9
Long-term contract assets (included in other assets)	22.3	20.2
Short-term contract liabilities (included in short-term deferred revenue)	(119.7)	(124.8)
Long-term contract liabilities (included in long-term deferred revenue)	(72.5)	(68.4)
Net contract assets/(liabilities)	(139.6)	$ (143.1)
Contract with customer, liability, revenue recognized	148.9
Contract with customer, asset, reclassified to receivable	$ 26.7