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Corporate Investments And Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Money market securities and other cash equivalents - Amortized Cost $ 5,686.3 $ 2,771.8
Money market securities and other cash equivalents - Fair Value 5,686.3 2,771.8
Total available-for-sale securities - Amortized Cost 20,657.3 19,832.1
Available for Sale Securities - Unrealized Gains 265.1 362.5
Available for sale securities - Unrealized Loss 48.6 38.1
Total available-for-sale securities - Fair Value 20,873.8 [1] 20,156.5 [2]
Total corporate investments and funds held for clients - Amortized Cost 26,343.6 22,603.9
Total corporate investments and funds held for clients - Gross Unrealized Gains 265.1 362.5
Total corporate investments and funds held for clients - Gross Unrealized Losses (48.6) (38.1)
Total corporate investments and funds held for clients - Fair Value 26,560.1 22,928.3
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available-for-sale securities - Amortized Cost 9,497.5 8,720.1
Available for Sale Securities - Unrealized Gains 115.7 171.1
Available for sale securities - Unrealized Loss 29.6 15.0
Total available-for-sale securities - Fair Value 9,583.6 [1] 8,876.2 [2]
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 5,764.3 6,051.4
Available for Sale Securities - Unrealized Gains 64.6 107.3
Available for sale securities - Unrealized Loss 9.8 11.7
Total available-for-sale securities - Fair Value 5,819.1 [1] 6,147.0 [2]
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available-for-sale securities - Amortized Cost 2,442.4 1,822.6
Available for Sale Securities - Unrealized Gains 11.1 6.1
Available for sale securities - Unrealized Loss 6.1 6.9
Total available-for-sale securities - Fair Value 2,447.4 [1] 1,821.8 [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 923.2 1,031.4
Available for Sale Securities - Unrealized Gains 15.4 7.6
Available for sale securities - Unrealized Loss 0.2 0.8
Total available-for-sale securities - Fair Value 938.4 [1] 1,038.2 [2]
Canadian Provincial Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available-for-sale securities - Amortized Cost 723.9 747.7
Available for Sale Securities - Unrealized Gains 27.9 25.3
Available for sale securities - Unrealized Loss 0.8 2.5
Total available-for-sale securities - Fair Value 751.0 [1] 770.5 [2]
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available-for-sale securities - Amortized Cost 586.6 543.3
Available for Sale Securities - Unrealized Gains 14.3 19.4
Available for sale securities - Unrealized Loss 1.4 0.5
Total available-for-sale securities - Fair Value 599.5 [1] 562.2 [2]
Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available-for-sale securities - Amortized Cost 719.4 915.6
Available for Sale Securities - Unrealized Gains 16.1 25.7
Available for sale securities - Unrealized Loss 0.7 0.7
Total available-for-sale securities - Fair Value 734.8 [1] 940.6 [2]
Corporate Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available-for-sale securities - Fair Value 55.5 2,086.3
Funds Held For Clients [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available-for-sale securities - Fair Value $ 20,818.3 $ 18,070.2
[1] 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.
[2] Included within available-for-sale securities are corporate investments with fair values of $2,086.3 million and funds held for clients with fair values of $18,070.2 million.