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Corporate Investments and Funds Held for Clients (Tables)
 3 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Debt Securities, Available-for-Sale
Corporate investments and funds held for clients at September 30, 2025 and June 30, 2025 were as follows:
 September 30, 2025
Amortized
Cost		Gross
Unrealized
 Gains		Gross
Unrealized
Losses		 Fair Market Value (A)
Type of issue:   
Money market securities, cash and other cash equivalents$3,991.7 $— $— $3,991.7 
Available-for-sale securities:
Corporate bonds17,012.4 148.2 (333.7)16,826.9 
U.S. Treasury securities10,874.5 103.6 (32.3)10,945.8 
Asset-backed securities2,060.9 28.5 (11.1)2,078.3 
Canadian government obligations and
Canadian government agency obligations		1,747.7 19.2 (25.0)1,741.9 
Canadian provincial bonds1,123.1 18.0 (22.6)1,118.5 
U.S. government agency securities1,007.4 4.4 (69.0)942.8 
Other securities2,037.8 11.4 (51.1)1,998.1 
Total available-for-sale securities35,863.8 333.3 (544.8)35,652.3 
Total corporate investments and funds held for clients$39,855.5 $333.3 $(544.8)$39,644.0 
(A) Included within available-for-sale securities are corporate investments with fair values of $5,466.1 million and funds held for clients with fair values of $30,186.2 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 Market 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 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 
(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 $29,278.9 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.
Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value
The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of September 30, 2025, are as follows: 
September 30, 2025
Securities in Unrealized Loss Position Less Than 12 MonthsSecurities in Unrealized Loss Position Greater Than 12 MonthsTotal
Gross
Unrealized
Losses		Fair Market
Value		Gross
Unrealized
Losses		Fair Market
Value 		Gross
Unrealized
Losses		Fair
Market Value
Corporate bonds$(1.4)$292.7 $(332.3)$9,439.8 $(333.7)$9,732.5 
U.S. Treasury securities(4.3)955.1 (28.0)1,809.1 (32.3)2,764.2 
Asset-backed securities(0.2)74.7 (10.9)469.7 (11.1)544.4 
Canadian government obligations and
Canadian government agency obligations		(0.3)175.1 (24.7)686.4 (25.0)861.5 
Canadian provincial bonds(0.3)55.8 (22.3)547.5 (22.6)603.3 
U.S. government agency securities(0.1)10.4 (68.9)773.1 (69.0)783.5 
Other securities(0.6)237.2 (50.5)1,061.0 (51.1)1,298.2 
 $(7.2)$1,801.0 $(537.6)$14,786.6 $(544.8)$16,587.6 
The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of June 30, 2025, are as follows:
June 30, 2025
Securities in Unrealized Loss Position Less Than 12 MonthsSecurities in Unrealized Loss Position Greater Than 12 MonthsTotal
Gross
Unrealized
Losses		Fair Market
Value		Gross
Unrealized
Losses		Fair Market
Value 		Gross
Unrealized
Losses		Fair
Market Value
Corporate bonds$(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:
September 30,June 30,
20252025
Corporate investments:  
Cash and cash equivalents$2,478.0 $3,347.8 
Short-term marketable securities5,466.1 4,498.8 
Total corporate investments$7,944.1 $7,846.6 
Schedule of Investment of Funds Held for Clients
Funds held for clients have been invested in the following categories:
September 30,June 30,
20252025
Funds held for clients:  
Restricted cash and cash equivalents held to satisfy client funds obligations$1,513.7 $1,706.8 
Restricted short-term marketable securities held to satisfy client funds obligations2,281.6 3,155.7 
Restricted long-term marketable securities held to satisfy client funds obligations27,904.6 26,123.2 
Total funds held for clients$31,699.9 $30,985.7 
Schedule of Expected Maturities of Available-for-Sale Securities
Expected maturities of available-for-sale securities at September 30, 2025 are as follows:
One year or less$7,747.6 
One year to two years4,548.1 
Two years to three years5,598.5 
Three years to four years5,572.6 
After four years12,185.5 
Total available-for-sale securities$35,652.3