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Corporate Investments and Funds Held for Clients - Corporate Investments and Funds Held for Clients (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Money market securities, cash and other cash equivalents - amortized cost | $ 2,680.6 | $ 2,913.4 | $ 3,291.7
Amortized Cost | 34,544.6 | 32,723.3 |
Gross Unrealized Gains | 168.2 | 30.9 |
Gross Unrealized Losses | (856.2) | (1,546.7) |
Fair market value | 33,856.6 | 31,207.5 |
Total corporate investments and funds held for clients - amortized cost | 42,743.8 | 42,809.3 |
Total corporate investments and funds held for clients - gross unrealized gains | 168.2 | 30.9 |
Total corporate investments and funds held for clients - gross unrealized losses | (856.2) | (1,546.7) |
Total corporate investments and funds held for clients - fair market value | 42,055.8 | 41,293.5 |
Corporate bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 17,602.6 | 16,833.3 |
Gross Unrealized Gains | 56.3 | 11.5 |
Gross Unrealized Losses | (536.7) | (944.8) |
Fair market value | 17,122.2 | 15,900.0 |
U.S. Treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 8,494.6 | 7,701.2 |
Gross Unrealized Gains | 56.1 | 9.0 |
Gross Unrealized Losses | (62.5) | (164.5) |
Fair market value | 8,488.2 | 7,545.7 |
Canadian government obligations and Canadian government agency obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 2,167.1 | 2,130.7 |
Gross Unrealized Gains | 21.1 | 1.7 |
Gross Unrealized Losses | (37.0) | (86.6) |
Fair market value | 2,151.2 | 2,045.8 |
U.S. government agency securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,588.4 | 1,645.0 |
Gross Unrealized Gains | 2.0 | 0.5 |
Gross Unrealized Losses | (91.8) | (140.6) |
Fair market value | 1,498.6 | 1,504.9 |
Asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,788.1 | 1,394.9 |
Gross Unrealized Gains | 15.2 | 3.9 |
Gross Unrealized Losses | (21.1) | (43.0) |
Fair market value | 1,782.2 | 1,355.8 |
Canadian provincial bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,131.8 | 1,116.3 |
Gross Unrealized Gains | 14.6 | 2.3 |
Gross Unrealized Losses | (31.6) | (56.2) |
Fair market value | 1,114.8 | 1,062.4 |
Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 467.2 | 535.9 |
Gross Unrealized Gains | 0.4 | 0.0 |
Gross Unrealized Losses | (22.0) | (35.1) |
Fair market value | 445.6 | 500.8 |
Other securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,304.8 | 1,366.0 |
Gross Unrealized Gains | 2.5 | 2.0 |
Gross Unrealized Losses | (53.5) | (75.9) |
Fair market value | 1,253.8 | 1,292.1 |
Funds Held For Clients |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair market value | 33,856.6 | 30,823.5 |
Corporate Investments |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair market value | 0.0 | 384.0 |
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 | 8,199.2 | 10,086.0 |
Money market securities and other cash equivalents - fair market value | $ 8,199.2 | $ 10,086.0 |

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