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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Money market securities, cash and other cash equivalents - amortized cost | $ 2,575.2 | $ 1,908.5 | $ 1,949.2
Amortized Cost | 23,869.5 | 20,699.8 |
Gross Unrealized Gains | 579.9 | 877.5 |
Gross Unrealized Losses | (77.7) | (0.7) |
Fair market value | 24,371.7 | 21,576.6 |
Total corporate investments and funds held for clients - amortized cost | 37,012.7 | 27,753.4 |
Total corporate investments and funds held for clients - gross unrealized gains | 579.9 | 877.5 |
Total corporate investments and funds held for clients - gross unrealized losses | (77.7) | (0.7) |
Total corporate investments and funds held for clients - fair market value | 37,514.9 | 28,630.2 |
Corporate Investments |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair market value | 33.9 | 13.6 |
Funds Held For Clients |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair market value | 24,337.8 | 21,563.0 |
Corporate bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 11,732.3 | 9,188.7 |
Gross Unrealized Gains | 321.9 | 473.4 |
Gross Unrealized Losses | (38.5) | 0.0 |
Fair market value | 12,015.7 | 9,662.1 |
U.S. Treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 4,036.9 | 3,580.6 |
Gross Unrealized Gains | 64.8 | 120.8 |
Gross Unrealized Losses | (9.3) | 0.0 |
Fair market value | 4,092.4 | 3,701.4 |
Asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 2,279.8 | 3,274.6 |
Gross Unrealized Gains | 60.9 | 96.0 |
Gross Unrealized Losses | (0.9) | (0.5) |
Fair market value | 2,339.8 | 3,370.1 |
Canadian government obligations and Canadian government agency obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,542.3 | 1,018.7 |
Gross Unrealized Gains | 15.0 | 23.1 |
Gross Unrealized Losses | (9.0) | 0.0 |
Fair market value | 1,548.3 | 1,041.8 |
U.S. government agency securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,446.3 | 1,128.2 |
Gross Unrealized Gains | 22.5 | 35.6 |
Gross Unrealized Losses | (9.4) | 0.0 |
Fair market value | 1,459.4 | 1,163.8 |
Canadian provincial bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 956.3 | 676.6 |
Gross Unrealized Gains | 22.7 | 33.6 |
Gross Unrealized Losses | (5.3) | 0.0 |
Fair market value | 973.7 | 710.2 |
Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 793.4 | 814.3 |
Gross Unrealized Gains | 41.2 | 53.9 |
Gross Unrealized Losses | 0.0 | 0.0 |
Fair market value | 834.6 | 868.2 |
Other securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,082.2 | 1,018.1 |
Gross Unrealized Gains | 30.9 | 41.1 |
Gross Unrealized Losses | (5.3) | (0.2) |
Fair market value | 1,107.8 | 1,059.0 |
Money market securities, cash and other cash equivalents |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Money market securities, cash and other cash equivalents - amortized cost | 13,143.2 | 7,053.6 |
Money market securities and other cash equivalents - fair market value | $ 13,143.2 | $ 7,053.6 |

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