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Corporate Investments and Funds Held For Clients - Corporate Investments and Funds Held for Clients (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
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Debt Securities, Available-for-sale [Line Items] |  |  |
Money market securities, cash and other cash equivalents - amortized cost | $ 3,347.8 | $ 2,913.4 | $ 2,083.5
Amortized Cost | 34,203.4 | 32,723.3 |
Gross Unrealized Gains | 256.6 | 30.9 |
Gross Unrealized Losses | (682.3) | (1,546.7) |
Fair market value | 33,777.7 | 31,207.5 |
Total corporate investments and funds held for clients - amortized cost | 39,258.0 | 42,809.3 |
Total corporate investments and funds held for clients - gross unrealized gains | 256.6 | 30.9 |
Total corporate investments and funds held for clients - gross unrealized losses | (682.3) | (1,546.7) |
Total corporate investments and funds held for clients - fair market value | 38,832.3 | 41,293.5 |
Corporate bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 17,515.2 | 16,833.3 |
Gross Unrealized Gains | 108.7 | 11.5 |
Gross Unrealized Losses | (420.2) | (944.8) |
Fair market value | 17,203.7 | 15,900.0 |
U.S. Treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 8,416.8 | 7,701.2 |
Gross Unrealized Gains | 85.6 | 9.0 |
Gross Unrealized Losses | (43.7) | (164.5) |
Fair market value | 8,458.7 | 7,545.7 |
Canadian government obligations and Canadian government agency obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,972.0 | 2,130.7 |
Gross Unrealized Gains | 16.4 | 1.7 |
Gross Unrealized Losses | (32.4) | (86.6) |
Fair market value | 1,956.0 | 2,045.8 |
Asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,837.8 | 1,394.9 |
Gross Unrealized Gains | 22.6 | 3.9 |
Gross Unrealized Losses | (15.5) | (43.0) |
Fair market value | 1,844.9 | 1,355.8 |
U.S. government agency securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,328.5 | 1,645.0 |
Gross Unrealized Gains | 2.3 | 0.5 |
Gross Unrealized Losses | (80.0) | (140.6) |
Fair market value | 1,250.8 | 1,504.9 |
Canadian provincial bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,155.8 | 1,116.3 |
Gross Unrealized Gains | 13.8 | 2.3 |
Gross Unrealized Losses | (27.7) | (56.2) |
Fair market value | 1,141.9 | 1,062.4 |
Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 535.9 |
Gross Unrealized Gains |  | 0.0 |
Gross Unrealized Losses |  | (35.1) |
Fair market value | 438.6 | 500.8 |
Other securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,977.3 | 1,366.0 |
Gross Unrealized Gains | 7.2 | 2.0 |
Gross Unrealized Losses | (62.8) | (75.9) |
Fair market value | 1,921.7 | 1,292.1 |
Corporate Investments |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair market value | 4,498.8 | 384.0 |
Funds held for clients |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair market value | 29,278.9 | 30,823.5 |
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 | 5,054.6 | 10,086.0 |
Money market securities and other cash equivalents - fair market value | $ 5,054.6 | $ 10,086.0 |

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