Corporate Investments And Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents	$ 1,647.7	$ 1,548.1	$ 1,665.1	$ 1,389.4
Short-term marketable securities	32.6	30.4
Long-term marketable securities	77.0	86.9
Total corporate investments	$ 1,757.3	$ 1,665.4