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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 | Jun. 30, 2025 | Jun. 30, 2024
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Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | $ (10.2) | $ (66.8)
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (672.1) | (1,479.9)
Total, Gross Unrealized Losses | (682.3) | (1,546.7)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 1,963.9 | 5,560.0
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 16,184.9 | 22,249.9
Total, Fair Market Value | 18,148.8 | 27,809.9
Corporate bonds |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (5.4) | (25.8)
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (414.8) | (919.0)
Total, Gross Unrealized Losses | (420.2) | (944.8)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 690.4 | 2,173.6
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 10,218.8 | 12,413.4
Total, Fair Market Value | 10,909.2 | 14,587.0
U.S. Treasury securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (0.8) | (23.1)
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (42.9) | (141.4)
Total, Gross Unrealized Losses | (43.7) | (164.5)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 732.2 | 2,186.2
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 1,801.7 | 4,076.9
Total, Fair Market Value | 2,533.9 | 6,263.1
Canadian government obligations and Canadian government agency obligations |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (1.4) | (0.9)
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (31.0) | (85.7)
Total, Gross Unrealized Losses | (32.4) | (86.6)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 219.2 | 304.6
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 870.2 | 1,591.6
Total, Fair Market Value | 1,089.4 | 1,896.2
U.S. government agency securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (0.1) | (0.7)
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (79.9) | (139.9)
Total, Gross Unrealized Losses | (80.0) | (140.6)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 8.0 | 51.5
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 1,093.8 | 1,428.2
Total, Fair Market Value | 1,101.8 | 1,479.7
Asset-backed securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (0.2) | (2.3)
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (15.3) | (40.7)
Total, Gross Unrealized Losses | (15.5) | (43.0)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 101.4 | 351.4
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 481.4 | 668.0
Total, Fair Market Value | 582.8 | 1,019.4
Canadian provincial bonds |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (0.8) | (1.3)
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (26.9) | (54.9)
Total, Gross Unrealized Losses | (27.7) | (56.2)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 44.3 | 193.0
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 588.8 | 717.4
Total, Fair Market Value | 633.1 | 910.4
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses |  | (0.5)
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses |  | (34.6)
Total, Gross Unrealized Losses |  | (35.1)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value |  | 11.2
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value |  | 489.6
Total, Fair Market Value |  | 500.8
Other securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (1.5) | (12.2)
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (61.3) | (63.7)
Total, Gross Unrealized Losses | (62.8) | (75.9)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 168.4 | 288.5
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 1,130.2 | 864.8
Total, Fair Market Value | $ 1,298.6 | $ 1,153.3

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