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Corporate Investments And Funds Held For Clients (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
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Sep. 30, 2014 | Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | $ 20,237.2 | [1] | $ 20,156.5 | [2]
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 | 18,935.3 |  | 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 | 82.00% |  |  |
Federal Home Loan Banks [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 4,387.0 |  |  |
Federal Farm Credit Banks [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 1,222.0 |  |  |
Fixed Rate Credit Card [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 1,466.7 |  |  |
Asset-Backed Auto Loan Receivables [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 340.4 |  |  |
Rate Reduction [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 177.8 |  |  |
Supranational Bonds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 385.9 |  |  |
Sovereign Bonds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 321.3 |  |  |
Residential Mortgage-Backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 95.7 |  |  |
Corporate Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 2,308.2 |  | 2,086.3 |
Funds Held For Clients [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | $ 17,929.0 |  | $ 18,070.2 |
Earliest [Member] | Corporate Bond Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Debt Maturities, Date | Oct. 01, 2014 |  |  |
Earliest [Member] | US Treasury Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Debt Maturities, Date | Oct. 01, 2014 |  |  |
Latest [Member] | Corporate Bond Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Debt Maturities, Date | Jun. 01, 2023 |  |  |
Latest [Member] | US Treasury Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Debt Maturities, Date | Feb. 01, 2024 |  |  |
[1] | Included within available-for-sale securities are corporate investments with fair values of $2,308.2 million and funds held for clients with fair values of $17,929.0 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. All available-for-sale securities were included in Level 2.

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