Corporate Investments And Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents	$ 3,184.7	$ 1,639.3	$ 2,173.5
Short-term marketable securities	27.2	26.6
Long-term marketable securities	21.3	28.9
Total corporate investments	$ 3,233.2	$ 1,694.8