Corporate Investments And Funds Held For Clients (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Available-for-sale securities - fair value	$ 16,927.5	$ 15,517.0
Client funds obligations	24,591.1	18,136.7
Available-for-sale securities, continuous unrealized loss position, aggregate losses	34.6	14.4
Average collected but not yet remitted funds	16,865.4	15,194.5	15,162.4
Percentage of the available-for-sale securities were rated AAA or AA	86.00%
Client funds investments with original maturities	90 days or less
Federal Home Loan Banks [Member]
Available-for-sale securities - fair value	3,886.5	2,615.5
Federal Home Loan Mortgage Corporation ("Freddie Mac") [Member]
Available-for-sale securities - fair value	759.1	1,136.1
Federal National Mortgage Association ("Fannie Mae") [Member]
Available-for-sale securities - fair value	702.4	933.6
Fixed Rate Credit Card [Member]
Available-for-sale securities - fair value	220.5	548.6
Rate Reduction [Member]
Available-for-sale securities - fair value	196.9	307.8
Asset-Backed Auto Loan Receivables [Member]
Available-for-sale securities - fair value	30.0	112.4
Residential Mortgage Backed Securities [Member]
Available-for-sale securities - fair value	146.5	131.0
Canadian Provincial Bonds [Member]
Available-for-sale securities - fair value	494.3	308.5
Corporate Bonds Backed By Federal Deposit Insurance Corporation Temporary Liquidity Guarantee Program [Member]
Available-for-sale securities - fair value	129.1	131.3
Sovereign Bonds [Member]
Available-for-sale securities - fair value	328.8	181.8
Supranational Bonds [Member]
Available-for-sale securities - fair value	360.1	322.7
Federal Farm Credit Banks [Member]
Available-for-sale securities - fair value	$ 914.0	$ 736.8

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized neither as held-to-maturity nor trading securities.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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