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Corporate Investments and Funds Held for Clients - Corporate Investments and Funds Held for Clients (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Money market securities, cash and other cash equivalents - amortized cost | $ 2,216.4 | $ 2,913.4 | $ 1,641.3
Amortized Cost | 34,094.4 | 32,723.3 |
Gross unrealized gains | 66.1 | 30.9 |
Gross unrealized losses | (1,140.6) | (1,546.7) |
Fair market value | 33,019.9 | 31,207.5 |
Total corporate investments and funds held for clients - amortized cost | 50,698.6 | 42,809.3 |
Total corporate investments and funds held for clients - gross unrealized gains | 66.1 | 30.9 |
Total corporate investments and funds held for clients - gross unrealized losses | (1,140.6) | (1,546.7) |
Total corporate investments and funds held for clients - fair market value | 49,624.1 | 41,293.5 |
Corporate bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 17,699.9 | 16,833.3 |
Gross unrealized gains | 17.1 | 11.5 |
Gross unrealized losses | (708.7) | (944.8) |
Fair market value | 17,008.3 | 15,900.0 |
U.S. Treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 8,167.5 | 7,701.2 |
Gross unrealized gains | 17.7 | 9.0 |
Gross unrealized losses | (99.0) | (164.5) |
Fair market value | 8,086.2 | 7,545.7 |
Canadian government obligations and Canadian government agency obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 2,183.3 | 2,130.7 |
Gross unrealized gains | 12.3 | 1.7 |
Gross unrealized losses | (51.7) | (86.6) |
Fair market value | 2,143.9 | 2,045.8 |
U.S. government agency securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,602.7 | 1,645.0 |
Gross unrealized gains | 0.2 | 0.5 |
Gross unrealized losses | (118.1) | (140.6) |
Fair market value | 1,484.8 | 1,504.9 |
Asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,600.5 | 1,394.9 |
Gross unrealized gains | 8.3 | 3.9 |
Gross unrealized losses | (28.3) | (43.0) |
Fair market value | 1,580.5 | 1,355.8 |
Canadian provincial bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,108.5 | 1,116.3 |
Gross unrealized gains | 8.4 | 2.3 |
Gross unrealized losses | (42.6) | (56.2) |
Fair market value | 1,074.3 | 1,062.4 |
Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 481.4 | 535.9 |
Gross unrealized gains | 0.0 | 0.0 |
Gross unrealized losses | (28.4) | (35.1) |
Fair market value | 453.0 | 500.8 |
Other securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,250.6 | 1,366.0 |
Gross unrealized gains | 2.1 | 2.0 |
Gross unrealized losses | (63.8) | (75.9) |
Fair market value | 1,188.9 | 1,292.1 |
Funds Held For Clients |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair market value | 33,019.9 | 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 | 16,604.2 | 10,086.0 |
Money market securities and other cash equivalents - fair market value | $ 16,604.2 | $ 10,086.0 |

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