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Corporate Investments and Funds Held for Clients - Schedule of Available-For-Sale Securities that Have Been in an Unrealized Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Jun. 30, 2025
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Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | $ (92.2) | $ (10.2)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 10,688.7 | 1,963.9
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (445.0) | (672.1)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 10,595.8 | 16,184.9
Total, Gross Unrealized Losses | (537.2) | (682.3)
Total, Fair Market Value | 21,284.5 | 18,148.8
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (52.1) | (5.4)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 5,174.2 | 690.4
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (278.4) | (414.8)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 7,268.0 | 10,218.8
Total, Gross Unrealized Losses | (330.5) | (420.2)
Total, Fair Market Value | 12,442.2 | 10,909.2
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (17.5) | (0.8)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 3,162.6 | 732.2
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (9.5) | (42.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 758.3 | 1,801.7
Total, Gross Unrealized Losses | (27.0) | (43.7)
Total, Fair Market Value | 3,920.9 | 2,533.9
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (5.1) | (0.2)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 641.0 | 101.4
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (7.5) | (15.3)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 331.2 | 481.4
Total, Gross Unrealized Losses | (12.6) | (15.5)
Total, Fair Market Value | 972.2 | 582.8
Canadian government obligations and Canadian government agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (3.5) | (1.4)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 625.9 | 219.2
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (21.3) | (31.0)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 487.1 | 870.2
Total, Gross Unrealized Losses | (24.8) | (32.4)
Total, Fair Market Value | 1,113.0 | 1,089.4
Canadian provincial bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (1.3) | (0.8)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 166.1 | 44.3
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (19.6) | (26.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 444.0 | 588.8
Total, Gross Unrealized Losses | (20.9) | (27.7)
Total, Fair Market Value | 610.1 | 633.1
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (0.7) | (0.1)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 52.3 | 8.0
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (66.6) | (79.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 663.6 | 1,093.8
Total, Gross Unrealized Losses | (67.3) | (80.0)
Total, Fair Market Value | 715.9 | 1,101.8
Other securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (12.0) | (1.5)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 866.6 | 168.4
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (42.1) | (61.3)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 643.6 | 1,130.2
Total, Gross Unrealized Losses | (54.1) | (62.8)
Total, Fair Market Value | $ 1,510.2 | $ 1,298.6

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