Corporate Investments And Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Jun. 30, 2013		Dec. 31, 2012	Jun. 30, 2012
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents	$ 1,267.1	[1]	$ 1,699.1	[1]	$ 1,390.9	$ 1,548.1
Short-term marketable securities	22.5	[1]	28.0
Long-term marketable securities	59.9	[1]	314.0	[1]
Total corporate investments	$ 1,349.5		$ 2,041.1

[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 10).