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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]    
Money market securities and other cash equivalents - Amortized Cost $ 2,272.2 $ 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 2,272.2 6,796.2
Available-for-sale securities - Amortized Cost 24,264.7 24,571.6
Available-for-sale securities - Gross Unrealized Gains 401.0 320.6
Available-for-sale securities - Gross Unrealized Losses (19.7) (33.1)
Available-for-sale securities - Fair Market Value 24,646.0 [1] 24,859.1 [2]
Total corporate investments and funds held for clients - Amortized Cost 26,536.9 31,367.8
Total corporate investments and funds held for clients - Gross Unrealized Gains 401.0 320.6
Total corporate investments and funds held for clients - Gross Unrealized Losses (19.7) (33.1)
Total corporate investments and funds held for clients - Fair Market Value 26,918.2 31,655.3
Corporate Investments    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 4,121.1 271.9
Funds Held For Clients    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 20,524.9 24,587.2
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Amortized Cost 10,716.8 10,691.8
Available-for-sale securities - Gross Unrealized Gains 232.7 182.8
Available-for-sale securities - Gross Unrealized Losses (2.2) (6.7)
Available-for-sale securities - Fair Market Value 10,947.3 10,867.9
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Amortized Cost 4,325.9 4,658.3
Available-for-sale securities - Gross Unrealized Gains 45.0 37.8
Available-for-sale securities - Gross Unrealized Losses (2.8) (5.4)
Available-for-sale securities - Fair Market Value 4,368.1 4,690.7
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Amortized Cost 2,106.7 2,612.0
Available-for-sale securities - Gross Unrealized Gains 25.1 17.7
Available-for-sale securities - Gross Unrealized Losses (2.2) (5.8)
Available-for-sale securities - Fair Market Value 2,129.6 2,623.9
U.S. government agency securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Amortized Cost 3,474.5 2,933.0
Available-for-sale securities - Gross Unrealized Gains 30.9 23.8
Available-for-sale securities - Gross Unrealized Losses (5.9) (8.0)
Available-for-sale securities - Fair Market Value 3,499.5 2,948.8
Canadian government obligations and Canadian government agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Amortized Cost 1,155.3 1,164.1
Available-for-sale securities - Gross Unrealized Gains 6.2 7.0
Available-for-sale securities - Gross Unrealized Losses (5.7) (6.0)
Available-for-sale securities - Fair Market Value 1,155.8 1,165.1
Canadian provincial bonds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Amortized Cost 793.7 800.2
Available-for-sale securities - Gross Unrealized Gains 16.0 14.5
Available-for-sale securities - Gross Unrealized Losses (0.3) (0.5)
Available-for-sale securities - Fair Market Value 809.4 814.2
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Amortized Cost 561.3 596.1
Available-for-sale securities - Gross Unrealized Gains 17.5 16.4
Available-for-sale securities - Gross Unrealized Losses (0.1) (0.1)
Available-for-sale securities - Fair Market Value 578.7 612.4
Other securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Amortized Cost 1,130.5 1,116.1
Available-for-sale securities - Gross Unrealized Gains 27.6 20.6
Available-for-sale securities - Gross Unrealized Losses (0.5) (0.6)
Available-for-sale securities - Fair Market Value $ 1,157.6 $ 1,136.1
[1] Included within available-for-sale securities are corporate investments with fair values of $4,121.1 million and funds held for clients with fair values of $20,524.9 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.