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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]    
Money market securities and other cash equivalents - Amortized Cost $ 14,211.5 $ 6,542.1
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 14,211.5 6,542.1
Available-for-sale securities - Amortized Cost 23,680.7 23,131.9
Available-for-sale securities - Gross Unrealized Gains 149.6 36.7
Available-for-sale securities - Gross Unrealized Losses (126.9) (392.4)
Available-for-sale securities - Fair Market Value 23,703.4 [1] 22,776.2 [2]
Total corporate investments and funds held for clients - Amortized Cost 37,892.2 29,674.0
Total corporate investments and funds held for clients - Gross Unrealized Gains 149.6 36.7
Total corporate investments and funds held for clients - Gross Unrealized Losses (126.9) (392.4)
Total corporate investments and funds held for clients - Fair Market Value 37,914.9 29,318.3
Corporate Investments    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 10.5 10.5
Funds Held For Clients    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 23,692.9 22,765.7
Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 10,116.6 9,819.4
Available-for-sale securities - Gross Unrealized Gains 86.3 20.3
Available-for-sale securities - Gross Unrealized Losses (39.8) (160.9)
Available-for-sale securities - Fair Market Value 10,163.1 9,678.8
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 4,572.8 4,555.5
Available-for-sale securities - Gross Unrealized Gains 13.1 0.3
Available-for-sale securities - Gross Unrealized Losses (22.7) (64.1)
Available-for-sale securities - Fair Market Value 4,563.2 4,491.7
U.S. Treasury securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 2,671.4 2,787.0
Available-for-sale securities - Gross Unrealized Gains 8.2 4.0
Available-for-sale securities - Gross Unrealized Losses (18.4) (47.7)
Available-for-sale securities - Fair Market Value 2,661.2 2,743.3
U.S. government agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 2,932.2 2,678.9
Available-for-sale securities - Gross Unrealized Gains 8.1 0.4
Available-for-sale securities - Gross Unrealized Losses (33.4) (76.9)
Available-for-sale securities - Fair Market Value 2,906.9 2,602.4
Canadian government obligations and Canadian government agency obligations    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 1,117.3 1,109.0
Available-for-sale securities - Gross Unrealized Gains 4.6 0.4
Available-for-sale securities - Gross Unrealized Losses (8.0) (20.6)
Available-for-sale securities - Fair Market Value 1,113.9 1,088.8
Canadian provincial bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 777.0 724.5
Available-for-sale securities - Gross Unrealized Gains 8.2 5.1
Available-for-sale securities - Gross Unrealized Losses (1.5) (7.4)
Available-for-sale securities - Fair Market Value 783.7 722.2
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 600.7 584.6
Available-for-sale securities - Gross Unrealized Gains 11.4 3.2
Available-for-sale securities - Gross Unrealized Losses (0.3) (4.3)
Available-for-sale securities - Fair Market Value 611.8 583.5
Other securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 892.7 873.0
Available-for-sale securities - Gross Unrealized Gains 9.7 3.0
Available-for-sale securities - Gross Unrealized Losses (2.8) (10.5)
Available-for-sale securities - Fair Market Value $ 899.6 $ 865.5
[1] Included within available-for-sale securities are corporate investments with fair values of $10.5 million and funds held for clients with fair values of $23,692.9 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 $10.5 million and funds held for clients with fair values of $22,765.7 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.