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Corporate Investments And Funds Held For Clients (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Earliest Corporate bond debt maturity date | October 2015 |  |  |
Latest corporate debt maturity date | June 2023 |  |  |
Earliest U.S. Treasury maturity date | November 2015 |  |  |
Latest U.S Treasury maturity date | August 2025 |  |  |
Available-for-sale securities - Fair Value | $ 20,374.8 | [1] | $ 20,873.8 | [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 | $ 24,240.2 |  | 24,650.5 |
Client funds investments with original maturities | ninety days or less |  |  |
Percent of Level Two Investment Pricing Inputs Provided by Pricing Service | 80.00% |  |  |
Federal Home Loan Banks [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | $ 3,968.5 |  |  |
Federal Farm Credit Banks [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 1,006.8 |  |  |
Fixed Rate Credit Card [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 1,806.1 |  |  |
Asset-Backed Auto Loan Receivables [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 455.4 |  |  |
Rate Reduction [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 239.4 |  |  |
Supranational Bonds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 254.2 |  |  |
Sovereign Bonds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 331.0 |  |  |
Residential Mortgage-Backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 92.6 |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 0.0 |  | 0.0 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | $ 0.0 |  | $ 0.0 |
[1] | Included within available-for-sale securities are corporate investments with fair values of $48.5 million and funds held for clients with fair values of $20,326.3 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 $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.

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