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Corporate Investments and Funds Held for Clients (Tables)
 6 Months Ended
Dec. 31, 2023
Corporate Investments And Funds Held For Clients [Abstract]  
Summary of Debt Securities, Available-for-Sale
Corporate investments and funds held for clients at December 31, 2023 and June 30, 2023 were as follows:
 December 31, 2023
Amortized
Cost		Gross
Unrealized
 Gains		Gross
Unrealized
Losses		 Fair Market Value (A)
Type of issue:   
Money market securities, cash and other cash equivalents$13,879.3 $— $— $13,879.3 
Available-for-sale securities:
Corporate bonds15,872.1 28.9 (934.8)14,966.2 
U.S. Treasury securities8,030.1 17.8 (174.7)7,873.2 
Canadian government obligations and Canadian government agency obligations
2,109.2 2.1 (101.6)2,009.7 
U.S. government agency securities1,661.1 0.3 (144.6)1,516.8 
Asset-backed securities1,152.4 6.2 (46.5)1,112.1 
Canadian provincial bonds992.5 4.7 (55.8)941.4 
Commercial mortgage-backed securities603.5 — (34.7)568.8 
Other securities1,367.7 7.7 (68.1)1,307.3 
Total available-for-sale securities31,788.6 67.7 (1,560.8)30,295.5 
Total corporate investments and funds held for clients$45,667.9 $67.7 $(1,560.8)$44,174.8 
(A) Included within available-for-sale securities are corporate investments with fair values of $24.4 million and funds held for clients with fair values of $30,271.1 million. All available-for-sale securities were included in Level 2 of the fair value
hierarchy.
 June 30, 2023
Amortized 
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Market Value (B)
Type of issue:    
Money market securities, cash and other cash equivalents$8,771.5 $— $— $8,771.5 
Available-for-sale securities: 
Corporate bonds15,870.7 4.7 (1,308.3)14,567.1 
U.S. Treasury securities8,054.7 0.7 (290.4)7,765.0 
Canadian government obligations and Canadian government agency obligations
2,070.4 — (145.0)1,925.4 
U.S. government agency securities1,670.0 0.2 (179.8)1,490.4 
Asset-backed securities1,234.7 — (69.7)1,165.0 
Canadian provincial bonds1,000.5 0.2 (78.1)922.6 
Commercial mortgage-backed securities679.2 — (46.7)632.5 
Other securities1,391.6 1.7 (96.4)1,296.9 
Total available-for-sale securities31,971.8 7.5 (2,214.4)29,764.9 
Total corporate investments and funds held for clients$40,743.3 $7.5 $(2,214.4)$38,536.4 
(B) Included within available-for-sale securities are corporate investments with fair values of $119.3 million and funds held for clients with fair values of $29,645.6 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.
Summary of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value
The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of December 31, 2023, are as follows: 
December 31, 2023
Securities in Unrealized Loss Position Less Than 12 MonthsSecurities in Unrealized Loss Position Greater Than 12 MonthsTotal
Gross
Unrealized
Losses		Fair Market
Value		Gross
Unrealized
Losses		Fair Market
Value 		Gross
Unrealized
Losses		Fair
Market Value
Corporate bonds$(3.6)$247.4 $(931.2)$13,349.4 $(934.8)$13,596.8 
U.S. Treasury securities(13.3)1,231.1 (161.4)5,589.2 (174.7)6,820.3 
Canadian government obligations and Canadian government agency obligations
(0.3)17.1 (101.3)1,772.8 (101.6)1,789.9 
U.S. government agency securities(0.1)18.8 (144.5)1,477.8 (144.6)1,496.6 
Asset-backed securities(0.5)56.7 (46.0)765.5 (46.5)822.2 
Canadian provincial bonds(0.2)32.1 (55.6)764.5 (55.8)796.6 
Commercial mortgage-backed securities(0.4)11.3 (34.3)557.5 (34.7)568.8 
Other securities(8.0)227.1 (60.1)780.1 (68.1)1,007.2 
 $(26.4)$1,841.6 $(1,534.4)$25,056.8 $(1,560.8)$26,898.4 
The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of June 30, 2023, are as follows:
June 30, 2023
Securities in Unrealized Loss Position Less Than 12 MonthsSecurities in Unrealized Loss Position Greater Than 12 MonthsTotal
Gross
Unrealized
Losses		Fair Market
Value		Gross
Unrealized
Losses		Fair Market
Value 		Gross
Unrealized
Losses		Fair
Market Value
Corporate bonds$(62.0)$2,255.9 $(1,246.3)$12,050.5 $(1,308.3)$14,306.4 
U.S. Treasury securities(85.5)4,629.4 (204.9)2,876.3 (290.4)7,505.7 
Canadian government obligations and Canadian government agency obligations
(5.8)333.9 (139.2)1,588.0 (145.0)1,921.9 
U.S. government agency securities(0.6)28.2 (179.2)1,432.2 (179.8)1,460.4 
Asset-backed securities(2.0)159.7 (67.7)975.6 (69.7)1,135.3 
Canadian provincial bonds(2.7)127.0 (75.4)757.3 (78.1)884.3 
Commercial mortgage-backed securities(6.7)126.9 (40.0)505.6 (46.7)632.5 
Other securities(14.5)574.0 (81.9)629.0 (96.4)1,203.0 
 $(179.8)$8,235.0 $(2,034.6)$20,814.5 $(2,214.4)$29,049.5 
Summary of Corporate Investments
Classification of corporate investments on the Consolidated Balance Sheets is as follows:
December 31,June 30,
20232023
Corporate investments:  
Cash and cash equivalents$1,641.3 $2,083.5 
Short-term marketable securities (a)24.4 14.7 
Long-term marketable securities (b)— 104.6 
Total corporate investments$1,665.7 $2,202.8 
 
(a) - Short-term marketable securities are included within Other current assets on the Consolidated Balance Sheets.
(b) - Long-term marketable securities are included within Other assets on the Consolidated Balance Sheets.
Summary of Investment of Funds Held for Clients
Funds held for clients have been invested in the following categories:
December 31,June 30,
20232023
Funds held for clients:  
Restricted cash and cash equivalents held to satisfy client funds obligations$12,238.0 $6,688.0 
Restricted short-term marketable securities held to satisfy client funds obligations6,479.6 5,601.9 
Restricted long-term marketable securities held to satisfy client funds obligations23,791.5 24,043.7 
Total funds held for clients$42,509.1 $36,333.6 
Summary of Expected Maturities of Available for Sale Securities
Expected maturities of available-for-sale securities at December 31, 2023 are as follows:
One year or less$6,504.0 
One year to two years6,799.5 
Two years to three years7,078.7 
Three years to four years2,336.7 
After four years7,576.6 
Total available-for-sale securities$30,295.5