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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]    
Money market securities and other cash equivalents - Amortized Cost $ 11,721.5 $ 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 11,721.5 15,458.6
Available-for-sale securities - Amortized Cost 21,434.5 21,094.8
Available-for-sale securities - Gross Unrealized Gains 147.2 511.7
Available-for-sale securities - Gross Unrealized Losses (123.0) (1.5)
Available-for-sale securities - Fair Market Value 21,458.7 [1] 21,605.0 [2]
Total corporate investments and funds held for clients - Amortized Cost 33,156.0 36,553.4
Total corporate investments and funds held for clients - Gross Unrealized Gains 147.2 511.7
Total corporate investments and funds held for clients - Gross Unrealized Losses (123.0) (1.5)
Total corporate investments and funds held for clients - Fair Market Value 33,180.2 37,063.6
Corporate Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 48.6 31.3
Funds Held For Clients [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 21,410.1 21,573.7
Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 9,221.1 9,429.2
Available-for-sale securities - Gross Unrealized Gains 75.6 261.8
Available-for-sale securities - Gross Unrealized Losses (49.2) (0.6)
Available-for-sale securities - Fair Market Value 9,247.5 9,690.4
U.S. government agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 3,833.5 4,298.8
Available-for-sale securities - Gross Unrealized Gains 21.6 91.3
Available-for-sale securities - Gross Unrealized Losses (20.5) 0.0
Available-for-sale securities - Fair Market Value 3,834.6 4,390.1
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 4,260.5 3,761.9
Available-for-sale securities - Gross Unrealized Gains 10.5 59.0
Available-for-sale securities - Gross Unrealized Losses (17.3) (0.3)
Available-for-sale securities - Fair Market Value 4,253.7 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 955.3 995.1
Available-for-sale securities - Gross Unrealized Gains 5.4 12.8
Available-for-sale securities - Gross Unrealized Losses (5.8) 0.0
Available-for-sale securities - Fair Market Value 954.9 1,007.9
Canadian provincial bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 699.2 735.4
Available-for-sale securities - Gross Unrealized Gains 16.3 30.8
Available-for-sale securities - Gross Unrealized Losses (1.2) (0.1)
Available-for-sale securities - Fair Market Value 714.3 766.1
U.S. Treasury securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 1,364.7 746.9
Available-for-sale securities - Gross Unrealized Gains 1.9 16.3
Available-for-sale securities - Gross Unrealized Losses (21.6) 0.0
Available-for-sale securities - Fair Market Value 1,345.0 763.2
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 614.5 594.2
Available-for-sale securities - Gross Unrealized Gains 7.9 23.9
Available-for-sale securities - Gross Unrealized Losses (5.7) (0.3)
Available-for-sale securities - Fair Market Value 616.7 617.8
Other securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 485.7 533.3
Available-for-sale securities - Gross Unrealized Gains 8.0 15.8
Available-for-sale securities - Gross Unrealized Losses (1.7) (0.2)
Available-for-sale securities - Fair Market Value $ 492.0 $ 548.9
[1] Included within available-for-sale securities are corporate investments with fair values of $48.6 million and funds held for clients with fair values of $21,410.1 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.