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, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents	$ 1,665.1	$ 1,389.4	$ 1,600.9	$ 1,643.3
Short-term marketable securities	28.0	36.3
Long-term marketable securities	96.8	98.0
Total corporate investments	$ 1,789.9	$ 1,523.7