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, 2013		Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents	$ 1,699.1	[1]	$ 1,548.1	$ 1,389.4	$ 1,643.3
Short-term marketable securities	28.0		30.4
Long-term marketable securities	314.0	[1]	86.9
Total corporate investments	$ 2,041.1		$ 1,665.4

[1] As of June 30, 2013, $245.2 million of long-term marketable securities and $0.7 million of cash and cash equivalents have been pledged as collateral under the Company's reverse repurchase agreements (see Note 9).