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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]    
Money market securities and other cash equivalents - amortized cost $ 8,519.0 $ 6,796.2
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 8,519.0 6,796.2
Amortized Cost 23,548.1 24,571.6
Gross Unrealized  Gains 552.5 320.6
Gross Unrealized Losses (77.0) (33.1)
Fair market value 24,023.6 [1] 24,859.1 [2]
Total corporate investments and funds held for clients - amortized cost 32,067.1 31,367.8
Total corporate investments and funds held for clients - gross unrealized gains 552.5 320.6
Total corporate investments and funds held for clients - gross unrealized losses (77.0) (33.1)
Total corporate investments and funds held for clients - fair market value 32,542.6 31,655.3
Corporate Investments    
Debt Securities, Available-for-sale [Line Items]    
Fair market value 3.2 271.9
Funds Held For Clients    
Debt Securities, Available-for-sale [Line Items]    
Fair market value 24,020.4 24,587.2
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 10,802.4 10,691.8
Gross Unrealized  Gains 226.4 182.8
Gross Unrealized Losses (33.0) (6.7)
Fair market value 10,995.8 10,867.9
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 4,056.7 4,658.3
Gross Unrealized  Gains 27.4 37.8
Gross Unrealized Losses (42.1) (5.4)
Fair market value 4,042.0 4,690.7
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,491.4 2,612.0
Gross Unrealized  Gains 61.0 17.7
Gross Unrealized Losses 0.0 (5.8)
Fair market value 1,552.4 2,623.9
U.S. government agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,585.9 2,933.0
Gross Unrealized  Gains 129.4 23.8
Gross Unrealized Losses 0.0 (8.0)
Fair market value 3,715.3 2,948.8
Canadian government obligations and Canadian government agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,007.0 1,164.1
Gross Unrealized  Gains 16.2 7.0
Gross Unrealized Losses (0.3) (6.0)
Fair market value 1,022.9 1,165.1
Canadian provincial bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 731.4 800.2
Gross Unrealized  Gains 24.4 14.5
Gross Unrealized Losses 0.0 (0.5)
Fair market value 755.8 814.2
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 581.4 596.1
Gross Unrealized  Gains 17.0 16.4
Gross Unrealized Losses (0.5) (0.1)
Fair market value 597.9 612.4
Other securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,291.9 1,116.1
Gross Unrealized  Gains 50.7 20.6
Gross Unrealized Losses (1.1) (0.6)
Fair market value $ 1,341.5 $ 1,136.1
[1] Included within available-for-sale securities are corporate investments with fair values of $3.2 million and funds held for clients with fair values of $24,020.4 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 $271.9 million and funds held for clients with fair values of $24,587.2 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.