Corporate Investments And Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents	$ 1,548.1	$ 1,389.4	$ 1,643.3	$ 2,265.3
Short-term marketable securities	30.4	36.3
Long-term marketable securities	86.9	98.0
Total corporate investments	$ 1,665.4	$ 1,523.7