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Corporate Investments and Funds Held for Clients - Corporate Investments and Funds Held for Clients (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]      
Money market securities, cash and other cash equivalents - amortized cost $ 2,216.4 $ 2,913.4 $ 1,641.3
Amortized Cost 34,094.4 32,723.3  
Gross unrealized gains 66.1 30.9  
Gross unrealized losses (1,140.6) (1,546.7)  
Fair market value 33,019.9 31,207.5  
Total corporate investments and funds held for clients - amortized cost 50,698.6 42,809.3  
Total corporate investments and funds held for clients - gross unrealized gains 66.1 30.9  
Total corporate investments and funds held for clients - gross unrealized losses (1,140.6) (1,546.7)  
Total corporate investments and funds held for clients - fair market value 49,624.1 41,293.5  
Corporate bonds      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 17,699.9 16,833.3  
Gross unrealized gains 17.1 11.5  
Gross unrealized losses (708.7) (944.8)  
Fair market value 17,008.3 15,900.0  
U.S. Treasury securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 8,167.5 7,701.2  
Gross unrealized gains 17.7 9.0  
Gross unrealized losses (99.0) (164.5)  
Fair market value 8,086.2 7,545.7  
Canadian government obligations and Canadian government agency obligations      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 2,183.3 2,130.7  
Gross unrealized gains 12.3 1.7  
Gross unrealized losses (51.7) (86.6)  
Fair market value 2,143.9 2,045.8  
U.S. government agency securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 1,602.7 1,645.0  
Gross unrealized gains 0.2 0.5  
Gross unrealized losses (118.1) (140.6)  
Fair market value 1,484.8 1,504.9  
Asset-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 1,600.5 1,394.9  
Gross unrealized gains 8.3 3.9  
Gross unrealized losses (28.3) (43.0)  
Fair market value 1,580.5 1,355.8  
Canadian provincial bonds      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 1,108.5 1,116.3  
Gross unrealized gains 8.4 2.3  
Gross unrealized losses (42.6) (56.2)  
Fair market value 1,074.3 1,062.4  
Commercial mortgage-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 481.4 535.9  
Gross unrealized gains 0.0 0.0  
Gross unrealized losses (28.4) (35.1)  
Fair market value 453.0 500.8  
Other securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 1,250.6 1,366.0  
Gross unrealized gains 2.1 2.0  
Gross unrealized losses (63.8) (75.9)  
Fair market value 1,188.9 1,292.1  
Funds Held For Clients      
Debt Securities, Available-for-sale [Line Items]      
Fair market value 33,019.9 30,823.5  
Corporate Investments      
Debt Securities, Available-for-sale [Line Items]      
Fair market value 0.0 384.0  
Money market securities, cash and other cash equivalents      
Debt Securities, Available-for-sale [Line Items]      
Money market securities, cash and other cash equivalents - amortized cost 16,604.2 10,086.0  
Money market securities and other cash equivalents - fair market value $ 16,604.2 $ 10,086.0