Corporate Investments And Funds Held For Clients (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2015		Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	$ 20,873.8	[1]	$ 20,156.5	[2]
Earliest corporate bond maturity date	July 2015
Latest corporate bond maturity date	June 2023
Earliest non-callable debt maturity date
Latest non-callable debt maturity date
Length of shortest cash flow of residential mortgages used as collateral for companies mortgage backed securities (in years)	15 years
Length of longest cash flow of residential mortgages used as collateral for company's mortgage backed securities (in years)	30 years
Client Fund Obligation repayment period	1 year
Client funds obligations	$ 24,650.5		18,963.4
Client funds investments with original maturities	90 days or less
Percentage of the available-for-sale securities were rated AAA or AA	80.00%
Federal Home Loan Banks [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	$ 4,416.8
Federal Farm Credit Banks [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	1,009.2
Fixed Rate Credit Card [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	1,696.0
Asset-Backed Auto Loan Receivables [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	375.6
Rate Reduction [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	239.9
Sovereign Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	317.6
Foreign Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	290.2
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	94.8
Funds Held For Clients [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	20,818.3		18,070.2
Corporate Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	$ 55.5		$ 2,086.3

[1] Included within available-for-sale securities are corporate investments with fair values of $55.5 million and funds held for clients with fair values of $20,818.3 million. All available-for-sale securities were included in Level 2.

[2] Included within available-for-sale securities are corporate investments with fair values of $2,086.3 million and funds held for clients with fair values of $18,070.2 million.