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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]    
Money market securities and other cash equivalents - Amortized Cost $ 4,408.3 $ 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 4,408.3 6,542.1
Available-for-sale securities - Amortized Cost 23,352.8 23,131.9
Available-for-sale securities - Gross Unrealized Gains 25.4 36.7
Available-for-sale securities - Gross Unrealized Losses (430.6) (392.4)
Available-for-sale securities - Fair Market Value 22,947.6 [1] 22,776.2 [2]
Total corporate investments and funds held for clients - Amortized Cost 27,761.1 29,674.0
Total corporate investments and funds held for clients - Gross Unrealized Gains 25.4 36.7
Total corporate investments and funds held for clients - Gross Unrealized Losses (430.6) (392.4)
Total corporate investments and funds held for clients - Fair Market Value 27,355.9 29,318.3
Corporate Investments    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 462.9 10.5
Funds Held For Clients    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 22,484.7 22,765.7
Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 9,999.1 9,819.4
Available-for-sale securities - Gross Unrealized Gains 15.2 20.3
Available-for-sale securities - Gross Unrealized Losses (167.2) (160.9)
Available-for-sale securities - Fair Market Value 9,847.1 9,678.8
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 4,540.6 4,555.5
Available-for-sale securities - Gross Unrealized Gains 0.1 0.3
Available-for-sale securities - Gross Unrealized Losses (66.2) (64.1)
Available-for-sale securities - Fair Market Value 4,474.5 4,491.7
U.S. government agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 2,738.9 2,787.0
Available-for-sale securities - Gross Unrealized Gains 2.6 4.0
Available-for-sale securities - Gross Unrealized Losses (53.2) (47.7)
Available-for-sale securities - Fair Market Value 2,688.3 2,743.3
U.S. Treasury securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 2,741.8 2,678.9
Available-for-sale securities - Gross Unrealized Gains 0.1 0.4
Available-for-sale securities - Gross Unrealized Losses (90.4) (76.9)
Available-for-sale securities - Fair Market Value 2,651.5 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 1,132.0 1,109.0
Available-for-sale securities - Gross Unrealized Gains 0.3 0.4
Available-for-sale securities - Gross Unrealized Losses (24.7) (20.6)
Available-for-sale securities - Fair Market Value 1,107.6 1,088.8
Canadian provincial bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 767.2 724.5
Available-for-sale securities - Gross Unrealized Gains 3.6 5.1
Available-for-sale securities - Gross Unrealized Losses (9.4) (7.4)
Available-for-sale securities - Fair Market Value 761.4 722.2
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 579.2 584.6
Available-for-sale securities - Gross Unrealized Gains 1.7 3.2
Available-for-sale securities - Gross Unrealized Losses (6.3) (4.3)
Available-for-sale securities - Fair Market Value 574.6 583.5
Other securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 854.0 873.0
Available-for-sale securities - Gross Unrealized Gains 1.8 3.0
Available-for-sale securities - Gross Unrealized Losses (13.2) (10.5)
Available-for-sale securities - Fair Market Value $ 842.6 $ 865.5
[1] Included within available-for-sale securities are corporate investments with fair values of $462.9 million and funds held for clients with fair values of $22,484.7 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 $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.