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Corporate Investments and Funds Held for Clients - Available-For-Sale Securities that Have Been in an Unrealized Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Jun. 30, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | $ (29.1) | $ (66.8)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 3,389.3 | 5,560.0
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (827.1) | (1,479.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 18,503.8 | 22,249.9
Total, Gross Unrealized Losses | (856.2) | (1,546.7)
Total, Fair Market Value | 21,893.1 | 27,809.9
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (18.9) | (25.8)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 1,724.1 | 2,173.6
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (517.8) | (919.0)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 11,020.7 | 12,413.4
Total, Gross Unrealized Losses | (536.7) | (944.8)
Total, Fair Market Value | 12,744.8 | 14,587.0
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (4.0) | (23.1)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 1,004.4 | 2,186.2
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (58.5) | (141.4)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 2,780.4 | 4,076.9
Total, Gross Unrealized Losses | (62.5) | (164.5)
Total, Fair Market Value | 3,784.8 | 6,263.1
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 | (0.1) | (0.9)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 19.9 | 304.6
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (36.9) | (85.7)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 1,115.6 | 1,591.6
Total, Gross Unrealized Losses | (37.0) | (86.6)
Total, Fair Market Value | 1,135.5 | 1,896.2
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (0.1) | (0.7)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 22.9 | 51.5
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (91.7) | (139.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 1,304.1 | 1,428.2
Total, Gross Unrealized Losses | (91.8) | (140.6)
Total, Fair Market Value | 1,327.0 | 1,479.7
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (1.3) | (2.3)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 230.8 | 351.4
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (19.8) | (40.7)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 530.9 | 668.0
Total, Gross Unrealized Losses | (21.1) | (43.0)
Total, Fair Market Value | 761.7 | 1,019.4
Canadian provincial bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (1.4) | (1.3)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 68.6 | 193.0
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (30.2) | (54.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 599.1 | 717.4
Total, Gross Unrealized Losses | (31.6) | (56.2)
Total, Fair Market Value | 667.7 | 910.4
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (0.1) | (0.5)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 4.0 | 11.2
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (21.9) | (34.6)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 419.5 | 489.6
Total, Gross Unrealized Losses | (22.0) | (35.1)
Total, Fair Market Value | 423.5 | 500.8
Other securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (3.2) | (12.2)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 314.6 | 288.5
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (50.3) | (63.7)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 733.5 | 864.8
Total, Gross Unrealized Losses | (53.5) | (75.9)
Total, Fair Market Value | $ 1,048.1 | $ 1,153.3

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