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Corporate Investments And Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]      
Money market securities and other cash equivalents - Amortized Cost $ 6,542.1 $ 8,181.6  
Cash Equivalents At Gross Unrealized Gains 0.0 0.0  
Cash Equivalents At Gross Unrealized Losses 0.0 0.0  
Money market securities and other cash equivalents - Fair Value 6,542.1 8,181.6 $ 15,458.6
Total available-for-sale securities - Amortized Cost 23,131.9 21,798.6  
Available for Sale Securities - Unrealized Gains 36.7 176.3  
Available for sale securities - Unrealized Loss (392.4) (73.8)  
Total available-for-sale securities - Fair Value 22,776.2 [1] 21,901.1  
Total corporate investments and funds held for clients - Amortized Cost 29,674.0 29,980.2  
Total corporate investments and funds held for clients - Gross Unrealized Gains 36.7 176.3  
Total corporate investments and funds held for clients - Gross Unrealized Losses (392.4) (73.8)  
Total corporate investments and funds held for clients - Fair Value 29,318.3 30,082.7  
Corporate Bonds [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities - Amortized Cost 9,819.4 9,325.3  
Available for Sale Securities - Unrealized Gains 20.3 98.8  
Available for sale securities - Unrealized Loss (160.9) (22.0)  
Total available-for-sale securities - Fair Value 9,678.8 9,402.1  
Asset-Backed Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities - Amortized Cost 4,555.5 4,453.1  
Available for Sale Securities - Unrealized Gains 0.3 16.9  
Available for sale securities - Unrealized Loss (64.1) (8.6)  
Total available-for-sale securities - Fair Value 4,491.7 4,461.4  
U.S. Treasury And Direct Obligations Of U.S. Government Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities - Amortized Cost 2,787.0 3,557.7  
Available for Sale Securities - Unrealized Gains 4.0 22.2  
Available for sale securities - Unrealized Loss (47.7) (13.4)  
Total available-for-sale securities - Fair Value 2,743.3 3,566.5  
US Treasury and Government [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities - Amortized Cost 2,678.9 1,585.9  
Available for Sale Securities - Unrealized Gains 0.4 2.6  
Available for sale securities - Unrealized Loss (76.9) (14.3)  
Total available-for-sale securities - Fair Value 2,602.4 1,574.2  
Canadian Government Obligations And Canadian Government Agency Obligations [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities - Amortized Cost 1,109.0 1,053.6  
Available for Sale Securities - Unrealized Gains 0.4 2.9  
Available for sale securities - Unrealized Loss (20.6) (11.4)  
Total available-for-sale securities - Fair Value 1,088.8 1,045.1  
Canadian Provincial Bonds [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities - Amortized Cost 724.5 746.9  
Available for Sale Securities - Unrealized Gains 5.1 14.3  
Available for sale securities - Unrealized Loss (7.4) (1.4)  
Total available-for-sale securities - Fair Value 722.2 759.8  
Municipal Bonds [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities - Amortized Cost 584.6 582.5  
Available for Sale Securities - Unrealized Gains 3.2 11.3  
Available for sale securities - Unrealized Loss (4.3) (1.3)  
Total available-for-sale securities - Fair Value 583.5 592.5  
Other Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities - Amortized Cost 873.0 493.6  
Available for Sale Securities - Unrealized Gains 3.0 7.3  
Available for sale securities - Unrealized Loss (10.5) (1.4)  
Total available-for-sale securities - Fair Value 865.5 499.5  
Corporate Investments [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities - Fair Value 10.5 10.8  
Funds Held For Clients [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities - Fair Value $ 22,765.7 $ 21,890.3  
[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 $22,765.7 million. All available-for-sale securities are included in Level 2 of the fair value hierarchy.