Corporate Investments And Funds Held For Clients (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2013		Jun. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	$ 18,838.7	[1]	$ 18,093.4	[2]
Earliest corporate bond maturity date	July 2013
Latest corporate bond maturity date	June 2023
Earliest non-callable debt maturity date	July 2013
Latest non-callable debt maturity date	May 2023
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	21,956.3		20,856.2
Client funds investments with original maturities	90 days or less
Percentage of the available-for-sale securities were rated AAA or AA	83.00%
Federal Home Loan Banks [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	4,325.4		4,189.1
Federal Farm Credit Banks [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	1,229.0		1,134.1
Fixed Rate Credit Card [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	904.5		323.0
Asset-Backed Auto Loan Receivables [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	315.7		85.1
Rate Reduction [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	95.4		140.0
Supranational Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	426.9		427.7
Sovereign Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	415.4		405.0
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	163.5		282.3
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	112.6		135.3
Fair Value, Inputs, Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	9.5		20.6
Funds Held For Clients [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - fair value	$ 18,496.7		$ 17,976.1

[1] Included within available-for-sale securities are corporate investments with fair values of $342.0 million and funds held for clients with fair values of $18,496.7 million. At June 30, 2013, Level 1 securities included $9.5 million of corporate investments classified within "Other securities," all remaining available-for-sale securities were included in Level 2.

[2] Included within available-for-sale securities are corporate investments with fair values of $117.3 million and funds held for clients with fair values of $17,976.1 million. At June 30, 2012, Level 1 securities included $20.6 million of corporate investments classified within "Other securities," all remaining available-for-sale securities were included in Level 2.