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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 | Dec. 31, 2024 | 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 | $ (85.9) | $ (66.8)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 7,236.0 | 5,560.0
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (1,054.7) | (1,479.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 19,578.3 | 22,249.9
Total, Gross Unrealized Losses | (1,140.6) | (1,546.7)
Total, Fair Market Value | 26,814.3 | 27,809.9
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (51.8) | (25.8)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 3,389.6 | 2,173.6
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (656.9) | (919.0)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 11,809.9 | 12,413.4
Total, Gross Unrealized Losses | (708.7) | (944.8)
Total, Fair Market Value | 15,199.5 | 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 | (20.3) | (23.1)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 2,677.3 | 2,186.2
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (78.7) | (141.4)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 2,754.4 | 4,076.9
Total, Gross Unrealized Losses | (99.0) | (164.5)
Total, Fair Market Value | 5,431.7 | 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 | (0.7) | (0.9)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 266.8 | 304.6
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (51.0) | (85.7)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 1,311.2 | 1,591.6
Total, Gross Unrealized Losses | (51.7) | (86.6)
Total, Fair Market Value | 1,578.0 | 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 | (1.9) | (0.7)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 113.0 | 51.5
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (116.2) | (139.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 1,346.8 | 1,428.2
Total, Gross Unrealized Losses | (118.1) | (140.6)
Total, Fair Market Value | 1,459.8 | 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 | (3.0) | (2.3)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 271.4 | 351.4
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (25.3) | (40.7)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 601.4 | 668.0
Total, Gross Unrealized Losses | (28.3) | (43.0)
Total, Fair Market Value | 872.8 | 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 | (3.9) | (1.3)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 166.5 | 193.0
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (38.7) | (54.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 612.7 | 717.4
Total, Gross Unrealized Losses | (42.6) | (56.2)
Total, Fair Market Value | 779.2 | 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 | (0.4) | (0.5)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 25.5 | 11.2
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (28.0) | (34.6)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 427.6 | 489.6
Total, Gross Unrealized Losses | (28.4) | (35.1)
Total, Fair Market Value | 453.1 | 500.8
Other securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (3.9) | (12.2)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 325.9 | 288.5
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (59.9) | (63.7)
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 714.3 | 864.8
Total, Gross Unrealized Losses | (63.8) | (75.9)
Total, Fair Market Value | $ 1,040.2 | $ 1,153.3

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