Corporate Investments And Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents	$ 2,941.4	$ 1,639.3	$ 1,805.7
Short-term marketable securities	23.7	26.6
Long-term marketable securities	7.8	28.9
Total corporate investments	$ 2,972.9	$ 1,694.8