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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]    
Money market securities and other cash equivalents - Amortized Cost $ 15,105.0 $ 15,458.6
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 15,105.0 15,458.6
Available-for-sale securities - Amortized Cost 21,717.7 21,094.8
Available-for-sale securities - Gross Unrealized Gains 163.1 511.7
Available-for-sale securities - Gross Unrealized Losses (92.4) (1.5)
Available-for-sale securities - Fair Market Value 21,788.4 [1] 21,605.0 [2]
Total corporate investments and funds held for clients - Amortized Cost 36,822.7 36,553.4
Total corporate investments and funds held for clients - Gross Unrealized Gains 163.1 511.7
Total corporate investments and funds held for clients - Gross Unrealized Losses (92.4) (1.5)
Total corporate investments and funds held for clients - Fair Market Value 36,893.4 37,063.6
Corporate Investments    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 10.8 31.3
Funds Held For Clients    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 21,777.6 21,573.7
Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 9,380.8 9,429.2
Available-for-sale securities - Gross Unrealized Gains 86.4 261.8
Available-for-sale securities - Gross Unrealized Losses (35.0) (0.6)
Available-for-sale securities - Fair Market Value 9,432.2 9,690.4
U.S. government agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 3,731.6 4,298.8
Available-for-sale securities - Gross Unrealized Gains 22.4 91.3
Available-for-sale securities - Gross Unrealized Losses (16.5) 0.0
Available-for-sale securities - Fair Market Value 3,737.5 4,390.1
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 4,384.9 3,761.9
Available-for-sale securities - Gross Unrealized Gains 13.4 59.0
Available-for-sale securities - Gross Unrealized Losses (13.3) (0.3)
Available-for-sale securities - Fair Market Value 4,385.0 3,820.6
Canadian government obligations and Canadian government agency obligations    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 984.1 995.1
Available-for-sale securities - Gross Unrealized Gains 4.7 12.8
Available-for-sale securities - Gross Unrealized Losses (4.3) 0.0
Available-for-sale securities - Fair Market Value 984.5 1,007.9
Canadian provincial bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 741.3 735.4
Available-for-sale securities - Gross Unrealized Gains 16.3 30.8
Available-for-sale securities - Gross Unrealized Losses (0.8) (0.1)
Available-for-sale securities - Fair Market Value 756.8 766.1
U.S. Treasury securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 1,389.1 746.9
Available-for-sale securities - Gross Unrealized Gains 2.2 16.3
Available-for-sale securities - Gross Unrealized Losses (18.0) 0.0
Available-for-sale securities - Fair Market Value 1,373.3 763.2
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 615.7 594.2
Available-for-sale securities - Gross Unrealized Gains 10.2 23.9
Available-for-sale securities - Gross Unrealized Losses (2.9) (0.3)
Available-for-sale securities - Fair Market Value 623.0 617.8
Other securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 490.2 533.3
Available-for-sale securities - Gross Unrealized Gains 7.5 15.8
Available-for-sale securities - Gross Unrealized Losses (1.6) (0.2)
Available-for-sale securities - Fair Market Value $ 496.1 $ 548.9
[1] 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 $21,777.6 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 $31.3 million and funds held for clients with fair values of $21,573.7 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.