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Corporate Investments And Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Jun. 30, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Money market securities and other cash equivalents - Amortized Cost | $ 7,367.1 |  | $ 5,686.3 |
Cash Equivalents At Gross Unrealized Gains | 0.0 |  | 0.0 |
Cash Equivalents At Gross Unrealized Losses | 0.0 |  | 0.0 |
Money market securities and other cash equivalents - Fair Value | 7,367.1 |  | 5,686.3 |
Available-for-sale securities - Amortized Cost | 20,104.9 |  | 20,657.3 |
Available-for-sale securities - Gross Unrealized Gains | 297.5 |  | 265.1 |
Available-for-sale securities - Gross Unrealized Losses | (27.6) |  | (48.6) |
Available-for-sale securities - Fair Value | 20,374.8 | [1] | 20,873.8 | [2]
Total corporate investments and funds held for clients - Amortized Cost | 27,472.0 |  | 26,343.6 |
Total Corporate Investments And Funds Held For Clients Gross Unrealized Gains | 297.5 |  | 265.1 |
Total corporate investments and funds held for clients - Gross Unrealized Losses | (27.6) |  | (48.6) |
Total Corporate Investments And Funds Held For Clients Fair Value | 27,741.9 |  | 26,560.1 |
Corporate Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 48.5 |  | 55.5 |
Funds Held For Clients [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 20,326.3 |  | 20,818.3 |
Corporate bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 9,250.8 |  | 9,497.5 |
Available-for-sale securities - Gross Unrealized Gains | 125.7 |  | 115.7 |
Available-for-sale securities - Gross Unrealized Losses | (22.1) |  | (29.6) |
Available-for-sale securities - Fair Value | 9,354.4 |  | 9,583.6 |
U.S. Treasury and direct obligations of U.S. government agencies |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 5,300.6 |  | 5,764.3 |
Available-for-sale securities - Gross Unrealized Gains | 74.9 |  | 64.6 |
Available-for-sale securities - Gross Unrealized Losses | (2.2) |  | (9.8) |
Available-for-sale securities - Fair Value | 5,373.3 |  | 5,819.1 |
Asset-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 2,660.8 |  | 2,442.4 |
Available-for-sale securities - Gross Unrealized Gains | 24.6 |  | 11.1 |
Available-for-sale securities - Gross Unrealized Losses | (1.7) |  | (6.1) |
Available-for-sale securities - Fair Value | 2,683.7 |  | 2,447.4 |
Canadian government obligations and Canadian government agency obligations |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 902.1 |  | 923.2 |
Available-for-sale securities - Gross Unrealized Gains | 13.1 |  | 15.4 |
Available-for-sale securities - Gross Unrealized Losses | (0.2) |  | (0.2) |
Available-for-sale securities - Fair Value | 915.0 |  | 938.4 |
Canadian provincial bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 704.9 |  | 723.9 |
Available-for-sale securities - Gross Unrealized Gains | 25.8 |  | 27.9 |
Available-for-sale securities - Gross Unrealized Losses | (0.6) |  | (0.8) |
Available-for-sale securities - Fair Value | 730.1 |  | 751.0 |
Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 588.4 |  | 586.6 |
Available-for-sale securities - Gross Unrealized Gains | 17.4 |  | 14.3 |
Available-for-sale securities - Gross Unrealized Losses | (0.5) |  | (1.4) |
Available-for-sale securities - Fair Value | 605.3 |  | 599.5 |
Other securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 697.3 |  | 719.4 |
Available-for-sale securities - Gross Unrealized Gains | 16.0 |  | 16.1 |
Available-for-sale securities - Gross Unrealized Losses | (0.3) |  | (0.7) |
Available-for-sale securities - Fair Value | $ 713.0 |  | $ 734.8 |
[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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