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Corporate Investments and Funds Held for Clients (Tables)
 12 Months Ended
Jun. 30, 2026
Corporate Investments And Funds Held For Clients [Abstract]  
Schedule of Debt Securities, Available-for-sale
Corporate investments and funds held for clients at June 30, 2026 and 2025 were as follows:
 
June 30, 2026
Amortized
Cost		Gross
Unrealized
 Gains		Gross
Unrealized
Losses		 Fair Value (A)
Type of issue:
Money market securities, cash and other cash equivalents$10,625.2 $— $— $10,625.2 
Available-for-sale securities:
Corporate bonds18,643.3 48.1 (342.0)18,349.4 
U.S. Treasury securities10,873.1 17.8 (57.4)10,833.5 
Asset-backed securities2,437.3 10.4 (15.0)2,432.7 
Canadian government obligations and
Canadian government agency obligations		2,055.0 13.9 (22.0)2,046.9 
Canadian provincial bonds1,186.2 15.3 (19.6)1,181.9 
U.S. government agency securities930.3 1.9 (70.5)861.7 
Other securities2,035.3 7.8 (47.9)1,995.2 
Total available-for-sale securities38,160.5 115.2 (574.4)37,701.3 
Total corporate investments and funds held for clients$48,785.7 $115.2 $(574.4)$48,326.5 

(A) Included within available-for-sale securities are corporate investments with fair values of $138.6 million and funds held for clients with fair values of $37,562.7 million. All available-for-sale securities are included in Level 2 of the fair value hierarchy.
June 30, 2025
Amortized 
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value (B)
Type of issue:
Money market securities, cash and other cash equivalents$5,054.6 $— $— $5,054.6 
Available-for-sale securities:
Corporate bonds17,515.2 108.7 (420.2)17,203.7 
U.S. Treasury securities8,416.8 85.6 (43.7)8,458.7 
Canadian government obligations and
Canadian government agency obligations		1,972.0 16.4 (32.4)1,956.0 
Asset-backed securities1,837.8 22.6 (15.5)1,844.9 
U.S. government agency securities
1,328.5 2.3 (80.0)1,250.8 
Canadian provincial bonds1,155.8 13.8 (27.7)1,141.9 
Other securities1,977.3 7.2 (62.8)1,921.7 
Total available-for-sale securities34,203.4 256.6 (682.3)33,777.7 
Total corporate investments and funds held for clients$39,258.0 $256.6 $(682.3)$38,832.3 

(B) Included within available-for-sale securities are corporate investments with fair values of $4,498.8 million and funds held for clients with fair values of $29,278.9 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.
Schedule of Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of June 30, 2026, are as follows:
 
June 30, 2026
Securities in unrealized loss position less than
12 months		Securities in unrealized loss position greater than 12 monthsTotal
Gross Unrealized
Losses		Fair Market
Value		Gross Unrealized
Losses		Fair Market
Value 		Gross
Unrealized
Losses		Fair
Market Value
Corporate bonds$(83.5)$7,318.7 $(258.5)$6,252.1 $(342.0)$13,570.8 
U.S. Treasury securities(51.8)6,176.1 (5.6)308.2 (57.4)6,484.3 
Asset-backed securities(8.8)992.6 (6.2)298.1 (15.0)1,290.7 
Canadian government obligations and
Canadian government agency obligations
(2.2)283.0 (19.8)444.4 (22.0)727.4 
Canadian provincial bonds(1.4)129.8 (18.2)379.4 (19.6)509.2 
U.S. government agency securities
(1.3)75.0 (69.2)659.9 (70.5)734.9 
Other securities(5.8)834.0 (42.1)587.5 (47.9)1,421.5 
$(154.8)$15,809.2 $(419.6)$8,929.6 $(574.4)$24,738.8 
The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of June 30, 2025 are as follows: 
June 30, 2025
Securities in unrealized loss position less than
12 months		Securities in unrealized loss position greater than 12 monthsTotal
Gross Unrealized
Losses		Fair Market
Value		Gross Unrealized
Losses		Fair Market
Value 		Gross
Unrealized
Losses		Fair
Market Value
Corporate bonds$(5.4)$690.4 $(414.8)$10,218.8 $(420.2)$10,909.2 
U.S. Treasury securities
(0.8)732.2 (42.9)1,801.7 (43.7)2,533.9 
Canadian government obligations and
Canadian government agency obligations
(1.4)219.2 (31.0)870.2 (32.4)1,089.4 
Asset-backed securities(0.2)101.4 (15.3)481.4 (15.5)582.8 
U.S. government agency securities
(0.1)8.0 (79.9)1,093.8 (80.0)1,101.8 
Canadian provincial bonds(0.8)44.3 (26.9)588.8 (27.7)633.1 
Other securities(1.5)168.4 (61.3)1,130.2 (62.8)1,298.6 
$(10.2)$1,963.9 $(672.1)$16,184.9 $(682.3)$18,148.8 
Schedule of Classification of Corporate Investments on the Consolidated Balance Sheets
Classification of corporate investments on the Consolidated Balance Sheets is as follows:
June 30,20262025
Corporate investments:
Cash and cash equivalents$4,230.1 $3,347.8 
Short-term marketable securities (a)— 4,498.8 
Long-term marketable securities (b)138.6 — 
Total corporate investments$4,368.7 $7,846.6 

(a) - Represents short-term marketable securities related to proceeds held from short-term U.S. commercial paper borrowings made in connection with our client funds investment strategy. Refer to Note 9 for further details.
(b) - Long-term marketable securities are included within Other assets on the Consolidated Balance Sheets.
Schedule of Investment of Funds Held for Clients
Funds held for clients have been invested in the following categories:
June 30,20262025
Funds held for clients:
Restricted cash and cash equivalents held to satisfy client funds obligations$6,395.1 $1,706.8 
Restricted short-term marketable securities held to satisfy client funds obligations5,871.3 3,155.7 
Restricted long-term marketable securities held to satisfy client funds obligations31,691.4 26,123.2 
Total funds held for clients$43,957.8 $30,985.7 
Schedule of Expected Maturities of Available-for-Sale Securities
Expected maturities of available-for-sale securities at June 30, 2026 are as follows:
One year or less$5,871.3 
One year to two years5,668.1 
Two years to three years6,585.0 
Three years to four years8,075.4 
After four years11,501.5 
Total available-for-sale securities$37,701.3