Corporate Investments And Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Jun. 30, 2014		Sep. 30, 2013
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents	$ 2,175.7		$ 1,585.9	[1]	$ 840.0
Short-term marketable securities	2,261.6	[1]	2,032.2	[1]
Long-term marketable securities	46.6		54.1	[1]
Total corporate investments	$ 4,483.9		$ 3,672.2

[1] As of September 30, 2014, $1,957.8 million of short-term marketable securities are related to the Company's outstanding commercial paper borrowings (see Note 9). As of June 30, 2014, $2,015.8 million of short-term marketable securities and $183.8 million of cash and cash equivalents are related to the Company's outstanding commercial paper borrowings (see Note 9).