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Corporate Investments And Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]    
Money market securities and other cash equivalents - Amortized Cost $ 7,367.1 $ 5,686.3
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 7,367.1 5,686.3
Available-for-sale securities - Amortized Cost 20,104.9 20,657.3
Available-for-sale securities - Gross Unrealized Gains 297.5 265.1
Available-for-sale securities - Gross Unrealized Losses (27.6) (48.6)
Available-for-sale securities - Fair Value 20,374.8 [1] 20,873.8 [2]
Total corporate investments and funds held for clients - Amortized Cost 27,472.0 26,343.6
Total Corporate Investments And Funds Held For Clients Gross Unrealized Gains 297.5 265.1
Total corporate investments and funds held for clients - Gross Unrealized Losses (27.6) (48.6)
Total Corporate Investments And Funds Held For Clients Fair Value 27,741.9 26,560.1
Corporate Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Value 48.5 55.5
Funds Held For Clients [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Value 20,326.3 20,818.3
Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 9,250.8 9,497.5
Available-for-sale securities - Gross Unrealized Gains 125.7 115.7
Available-for-sale securities - Gross Unrealized Losses (22.1) (29.6)
Available-for-sale securities - Fair Value 9,354.4 9,583.6
U.S. Treasury and direct obligations of U.S. government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 5,300.6 5,764.3
Available-for-sale securities - Gross Unrealized Gains 74.9 64.6
Available-for-sale securities - Gross Unrealized Losses (2.2) (9.8)
Available-for-sale securities - Fair Value 5,373.3 5,819.1
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 2,660.8 2,442.4
Available-for-sale securities - Gross Unrealized Gains 24.6 11.1
Available-for-sale securities - Gross Unrealized Losses (1.7) (6.1)
Available-for-sale securities - Fair Value 2,683.7 2,447.4
Canadian government obligations and Canadian government agency obligations    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 902.1 923.2
Available-for-sale securities - Gross Unrealized Gains 13.1 15.4
Available-for-sale securities - Gross Unrealized Losses (0.2) (0.2)
Available-for-sale securities - Fair Value 915.0 938.4
Canadian provincial bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 704.9 723.9
Available-for-sale securities - Gross Unrealized Gains 25.8 27.9
Available-for-sale securities - Gross Unrealized Losses (0.6) (0.8)
Available-for-sale securities - Fair Value 730.1 751.0
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 588.4 586.6
Available-for-sale securities - Gross Unrealized Gains 17.4 14.3
Available-for-sale securities - Gross Unrealized Losses (0.5) (1.4)
Available-for-sale securities - Fair Value 605.3 599.5
Other securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 697.3 719.4
Available-for-sale securities - Gross Unrealized Gains 16.0 16.1
Available-for-sale securities - Gross Unrealized Losses (0.3) (0.7)
Available-for-sale securities - Fair Value $ 713.0 $ 734.8
[1] Included within available-for-sale securities are corporate investments with fair values of $48.5 million and funds held for clients with fair values of $20,326.3 million. All available-for-sale securities were included in Level 2.
[2] Included within available-for-sale securities are corporate investments with fair values of $55.5 million and funds held for clients with fair values of $20,818.3 million. All available-for-sale securities were included in Level 2.