Discontinued Operations (Assets And Liabilities Of Discontinued Operations) (Details) (USD $) In Millions	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Total assets	$ 1,904.0	$ 1,794.4	$ 2,774.7
Accrued expenses and other current liabilities	230.3	261.2
Total liabilities	1,106.7	987.3
Net assets of discontinued operations	0	24.7
Allowance for doubtful accounts	0	2.0
Discontinued Operations [Member]
Cash and securities segregated for regulatory purposes and securities deposited with clearing organizations		67.0
Securities clearing receivables, net of allowance for doubtful accounts of zero and $2.0, respectively		52.5
Other assets		4.3
Total assets		123.8
Accrued expenses and other current liabilities		21.7
Securities clearing payables		77.4
Total liabilities		99.1
Net assets of discontinued operations		$ 24.7