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Corporate Investments And Funds Held For Clients (Tables)
 12 Months Ended
Jun. 30, 2025
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, 2025 and 2024 were as follows:
 
 June 30, 2025
Amortized
Cost		Gross
Unrealized
 Gains		Gross
Unrealized
Losses		 Fair Value (A)
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 securities1,328.5 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 

(A) 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 are included in Level 2 of the fair value hierarchy.
 June 30, 2024
Amortized 
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value (B)
Type of issue:    
Money market securities, cash and other cash equivalents$10,086.0 $— $— $10,086.0 
Available-for-sale securities:
Corporate bonds16,833.3 11.5 (944.8)15,900.0 
U.S. Treasury securities7,701.2 9.0 (164.5)7,545.7 
Canadian government obligations and
   Canadian government agency obligations		2,130.7 1.7 (86.6)2,045.8 
U.S. government agency securities
1,645.0 0.5 (140.6)1,504.9 
Asset-backed securities1,394.9 3.9 (43.0)1,355.8 
Canadian provincial bonds1,116.3 2.3 (56.2)1,062.4 
Commercial mortgage-backed securities535.9 — (35.1)500.8 
Other securities1,366.0 2.0 (75.9)1,292.1 
Total available-for-sale securities32,723.3 30.9 (1,546.7)31,207.5 
Total corporate investments and funds held for clients$42,809.3 $30.9 $(1,546.7)$41,293.5 
(B) Included within available-for-sale securities are corporate investments with fair values of $384.0 million and funds held for clients with fair values of $30,823.5 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, 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 

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, 2024 are as follows: 
June 30, 2024
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$(25.8)$2,173.6 $(919.0)$12,413.4 $(944.8)$14,587.0 
U.S. Treasury securities
(23.1)2,186.2 (141.4)4,076.9 (164.5)6,263.1 
Canadian government obligations and
Canadian government agency obligations
(0.9)304.6 (85.7)1,591.6 (86.6)1,896.2 
U.S. government agency securities
(0.7)51.5 (139.9)1,428.2 (140.6)1,479.7 
Asset-backed securities(2.3)351.4 (40.7)668.0 (43.0)1,019.4 
Canadian provincial bonds(1.3)193.0 (54.9)717.4 (56.2)910.4 
Commercial mortgage-backed securities(0.5)11.2 (34.6)489.6 (35.1)500.8 
Other securities(12.2)288.5 (63.7)864.8 (75.9)1,153.3 
 $(66.8)$5,560.0 $(1,479.9)$22,249.9 $(1,546.7)$27,809.9 
Schedule of Classification of Corporate Investments on the Consolidated Balance Sheets
Classification of corporate investments on the Consolidated Balance Sheets is as follows:
June 30,20252024
Corporate investments:  
Cash and cash equivalents$3,347.8 $2,913.4 
Short-term marketable securities4,498.8 384.0 
Total corporate investments$7,846.6 $3,297.4 
Schedule of Investment of Funds Held for Clients
Funds held for clients have been invested in the following categories:
June 30,20252024
Funds held for clients:  
Restricted cash and cash equivalents held to satisfy client funds obligations$1,706.8 $7,172.6 
Restricted short-term marketable securities held to satisfy client funds obligations3,155.7 5,538.1 
Restricted long-term marketable securities held to satisfy client funds obligations26,123.2 25,285.4 
Total funds held for clients$30,985.7 $37,996.1 
Schedule of Expected Maturities of Available-for-Sale Securities
Expected maturities of available-for-sale securities at June 30, 2025 are as follows:
One year or less$7,654.5 
One year to two years5,888.4 
Two years to three years4,322.9 
Three years to four years5,106.0 
After four years10,805.9 
Total available-for-sale securities$33,777.7