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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]        
Money market securities and other cash equivalents - Amortized Cost $ 6,083.2 $ 8,181.6    
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 6,083.2 8,181.6 $ 5,861.6 $ 15,458.6
Available-for-sale securities - Amortized Cost 22,017.0 21,798.6    
Available-for-sale securities - Gross Unrealized Gains 169.6 176.3    
Available-for-sale securities - Gross Unrealized Losses (80.0) (73.8)    
Available-for-sale securities - Fair Market Value 22,106.6 [1] 21,901.1 [2]    
Total corporate investments and funds held for clients - Amortized Cost 28,100.2 29,980.2    
Total corporate investments and funds held for clients - Gross Unrealized Gains 169.6 176.3    
Total corporate investments and funds held for clients - Gross Unrealized Losses (80.0) (73.8)    
Total corporate investments and funds held for clients - Fair Market Value 28,189.8 30,082.7    
Corporate Investments        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities - Fair Market Value 140.0 10.8    
Funds Held For Clients        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities - Fair Market Value 21,966.6 21,890.3    
Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities - Amortized Cost 9,417.1 9,325.3    
Available-for-sale securities - Gross Unrealized Gains 102.3 98.8    
Available-for-sale securities - Gross Unrealized Losses (18.3) (22.0)    
Available-for-sale securities - Fair Market Value 9,501.1 9,402.1    
Asset-backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities - Amortized Cost 4,206.3 4,453.1    
Available-for-sale securities - Gross Unrealized Gains 14.4 16.9    
Available-for-sale securities - Gross Unrealized Losses (8.7) (8.6)    
Available-for-sale securities - Fair Market Value 4,212.0 4,461.4    
U.S. government agency securities        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities - Amortized Cost 3,216.1 3,557.7    
Available-for-sale securities - Gross Unrealized Gains 19.8 22.2    
Available-for-sale securities - Gross Unrealized Losses (10.9) (13.4)    
Available-for-sale securities - Fair Market Value 3,225.0 3,566.5    
U.S. Treasury securities        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities - Amortized Cost 2,184.1 1,585.9    
Available-for-sale securities - Gross Unrealized Gains 2.3 2.6    
Available-for-sale securities - Gross Unrealized Losses (17.7) (14.3)    
Available-for-sale securities - Fair Market Value 2,168.7 1,574.2    
Canadian government obligations and Canadian government agency obligations        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities - Amortized Cost 1,125.7 1,053.6    
Available-for-sale securities - Gross Unrealized Gains 1.3 2.9    
Available-for-sale securities - Gross Unrealized Losses (19.1) (11.4)    
Available-for-sale securities - Fair Market Value 1,107.9 1,045.1    
Canadian provincial bonds        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities - Amortized Cost 767.6 746.9    
Available-for-sale securities - Gross Unrealized Gains 11.6 14.3    
Available-for-sale securities - Gross Unrealized Losses (2.6) (1.4)    
Available-for-sale securities - Fair Market Value 776.6 759.8    
Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities - Amortized Cost 577.0 582.5    
Available-for-sale securities - Gross Unrealized Gains 11.0 11.3    
Available-for-sale securities - Gross Unrealized Losses (1.2) (1.3)    
Available-for-sale securities - Fair Market Value 586.8 592.5    
Other securities        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities - Amortized Cost 523.1 493.6    
Available-for-sale securities - Gross Unrealized Gains 6.9 7.3    
Available-for-sale securities - Gross Unrealized Losses (1.5) (1.4)    
Available-for-sale securities - Fair Market Value $ 528.5 $ 499.5    
[1] Included within available-for-sale securities are corporate investments with fair values of $140.0 million and funds held for clients with fair values of $21,966.6 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 $10.8 million and funds held for clients with fair values of $21,890.3 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.