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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Schedule of Available-for-sale Securities [Line Items]      
Money market securities and other cash equivalents - Amortized Cost $ 13,444.9 $ 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 13,444.9 8,181.6 $ 15,105.0
Available-for-sale securities - Amortized Cost 22,799.5 21,798.6  
Available-for-sale securities - Gross Unrealized Gains 42.6 176.3  
Available-for-sale securities - Gross Unrealized Losses (339.4) (73.8)  
Available-for-sale securities - Fair Market Value 22,502.7 [1] 21,901.1 [2]  
Total corporate investments and funds held for clients - Amortized Cost 36,244.4 29,980.2  
Total corporate investments and funds held for clients - Gross Unrealized Gains 42.6 176.3  
Total corporate investments and funds held for clients - Gross Unrealized Losses (339.4) (73.8)  
Total corporate investments and funds held for clients - Fair Market Value 35,947.6 30,082.7  
Corporate Investments      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Fair Market Value 7.3 10.8  
Funds Held For Clients      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Fair Market Value 22,495.4 21,890.3  
Corporate bonds      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 9,547.9 9,325.3  
Available-for-sale securities - Gross Unrealized Gains 22.8 98.8  
Available-for-sale securities - Gross Unrealized Losses (134.5) (22.0)  
Available-for-sale securities - Fair Market Value 9,436.2 9,402.1  
Asset-backed securities      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 4,457.0 4,453.1  
Available-for-sale securities - Gross Unrealized Gains 0.4 16.9  
Available-for-sale securities - Gross Unrealized Losses (56.6) (8.6)  
Available-for-sale securities - Fair Market Value 4,400.8 4,461.4  
U.S. government agency securities      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 2,912.9 3,557.7  
Available-for-sale securities - Gross Unrealized Gains 5.6 22.2  
Available-for-sale securities - Gross Unrealized Losses (40.5) (13.4)  
Available-for-sale securities - Fair Market Value 2,878.0 3,566.5  
U.S. Treasury securities      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 2,576.3 1,585.9  
Available-for-sale securities - Gross Unrealized Gains 0.5 2.6  
Available-for-sale securities - Gross Unrealized Losses (66.4) (14.3)  
Available-for-sale securities - Fair Market Value 2,510.4 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 1,129.9 1,053.6  
Available-for-sale securities - Gross Unrealized Gains 0.8 2.9  
Available-for-sale securities - Gross Unrealized Losses (20.7) (11.4)  
Available-for-sale securities - Fair Market Value 1,110.0 1,045.1  
Canadian provincial bonds      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 735.8 746.9  
Available-for-sale securities - Gross Unrealized Gains 6.2 14.3  
Available-for-sale securities - Gross Unrealized Losses (6.4) (1.4)  
Available-for-sale securities - Fair Market Value 735.6 759.8  
Municipal bonds      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 592.0 582.5  
Available-for-sale securities - Gross Unrealized Gains 3.0 11.3  
Available-for-sale securities - Gross Unrealized Losses (5.3) (1.3)  
Available-for-sale securities - Fair Market Value 589.7 592.5  
Other securities      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 847.7 493.6  
Available-for-sale securities - Gross Unrealized Gains 3.3 7.3  
Available-for-sale securities - Gross Unrealized Losses (9.0) (1.4)  
Available-for-sale securities - Fair Market Value $ 842.0 $ 499.5  
[1] Included within available-for-sale securities are corporate investments with fair values of $7.3 million and funds held for clients with fair values of $22,495.4 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 $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.