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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]    
Money market securities and other cash equivalents - amortized cost $ 10,361.7 $ 7,053.6
Money market securities and other cash equivalents - gross unrealized gains 0.0 0.0
Money market securities and other cash equivalents - gross unrealized losses 0.0 0.0
Money market securities and other cash equivalents - fair market value 10,361.7 7,053.6
Amortized Cost 20,353.2 20,699.8
Gross Unrealized  Gains 853.3 877.5
Gross Unrealized Losses (1.4) (0.7)
Fair market value 21,205.1 [1] 21,576.6 [2]
Total corporate investments and funds held for clients - amortized cost 30,714.9 27,753.4
Total corporate investments and funds held for clients - gross unrealized gains 853.3 877.5
Total corporate investments and funds held for clients - gross unrealized losses (1.4) (0.7)
Total corporate investments and funds held for clients - fair market value 31,566.8 28,630.2
Corporate Investments    
Debt Securities, Available-for-sale [Line Items]    
Fair market value 3.4 13.6
Funds Held For Clients    
Debt Securities, Available-for-sale [Line Items]    
Fair market value 21,201.7 21,563.0
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 9,013.1 9,188.7
Gross Unrealized  Gains 458.0 473.4
Gross Unrealized Losses (0.4) 0.0
Fair market value 9,470.7 9,662.1
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,942.7 3,274.6
Gross Unrealized  Gains 98.4 96.0
Gross Unrealized Losses (0.2) (0.5)
Fair market value 3,040.9 3,370.1
U.S. government agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,581.3 3,580.6
Gross Unrealized  Gains 108.8 120.8
Gross Unrealized Losses 0.0 0.0
Fair market value 3,690.1 3,701.4
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,341.8 1,128.2
Gross Unrealized  Gains 34.5 35.6
Gross Unrealized Losses (0.8) 0.0
Fair market value 1,375.5 1,163.8
Canadian government obligations and Canadian government agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,037.0 1,018.7
Gross Unrealized  Gains 22.6 23.1
Gross Unrealized Losses 0.0 0.0
Fair market value 1,059.6 1,041.8
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 810.1 814.3
Gross Unrealized  Gains 54.5 53.9
Gross Unrealized Losses 0.0 0.0
Fair market value 864.6 868.2
Canadian provincial bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 652.7 676.6
Gross Unrealized  Gains 34.8 33.6
Gross Unrealized Losses 0.0 0.0
Fair market value 687.5 710.2
Other securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 974.5 1,018.1
Gross Unrealized  Gains 41.7 41.1
Gross Unrealized Losses 0.0 (0.2)
Fair market value $ 1,016.2 $ 1,059.0
[1] Included within available-for-sale securities are corporate investments with fair values of $3.4 million and funds held for clients with fair values of $21,201.7 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.
[2] Included within available-for-sale securities are corporate investments with fair values of $13.6 million and funds held for clients with fair values of $21,563.0 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.