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Corporate Investments And Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 2.6 $ 0.8
Money market securities and other cash equivalents - Amortized Cost 5,861.6 15,458.6
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 5,861.6 15,458.6
Available-for-sale securities - Amortized Cost 21,312.3 21,094.8
Available for Sale Securities - Unrealized Gains 441.7 511.7
Available-for-sale securities - Gross Unrealized Losses (3.0) (1.5)
Available-for-sale securities - Fair Value 21,751.0 [1] 21,605.0 [2]
Total corporate investments and funds held for clients - Amortized Cost 27,173.9 36,553.4
Total Corporate Investments And Funds Held For Clients Gross Unrealized Gains 441.7 511.7
Total corporate investments and funds held for clients - Gross Unrealized Losses (3.0) (1.5)
Total Corporate Investments And Funds Held For Clients Fair Value 27,612.6 37,063.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 974.2 295.9
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.4 0.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 194.7 217.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 3.0 1.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,168.9 513.8
Corporate Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Value 48.8 31.3
Funds Held For Clients [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Value 21,702.2 21,573.7
Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1.7 0.5
Available-for-sale securities - Amortized Cost 9,275.7 9,429.2
Available for Sale Securities - Unrealized Gains 230.1 261.8
Available-for-sale securities - Gross Unrealized Losses (1.7) (0.6)
Available-for-sale securities - Fair Value 9,504.1 9,690.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 474.8 138.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 0.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 41.4 35.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 1.7 0.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 516.2 173.1
U.S. government agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.1 0.0
Available-for-sale securities - Amortized Cost 4,092.8 4,298.8
Available for Sale Securities - Unrealized Gains 71.4 91.3
Available-for-sale securities - Gross Unrealized Losses (0.1) 0.0
Available-for-sale securities - Fair Value 4,164.1 4,390.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 94.8 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0.0 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0.1 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 94.8 0.0
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.3 0.1
Available-for-sale securities - Amortized Cost 4,134.6 3,761.9
Available for Sale Securities - Unrealized Gains 54.5 59.0
Available-for-sale securities - Gross Unrealized Losses (0.4) (0.3)
Available-for-sale securities - Fair Value 4,188.7 3,820.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 294.2 58.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.1 0.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 132.6 154.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0.4 0.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 426.8 213.6
Canadian government obligations and Canadian government agency obligations    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.0 0.0
Available-for-sale securities - Amortized Cost 984.9 995.1
Available for Sale Securities - Unrealized Gains 12.0 12.8
Available-for-sale securities - Gross Unrealized Losses 0.0 0.0
Available-for-sale securities - Fair Value 996.9 1,007.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 7.6 53.2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0.0 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0.0 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 7.6 53.2
Canadian provincial bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.0 0.1
Available-for-sale securities - Amortized Cost 721.6 735.4
Available for Sale Securities - Unrealized Gains 27.7 30.8
Available-for-sale securities - Gross Unrealized Losses 0.0 (0.1)
Available-for-sale securities - Fair Value 749.3 766.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 27.0 19.1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 7.7 7.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0.0 0.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 34.7 26.9
U.S. Treasury securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.0 0.0
Available-for-sale securities - Amortized Cost 947.6 746.9
Available for Sale Securities - Unrealized Gains 11.6 16.3
Available-for-sale securities - Gross Unrealized Losses 0.0 0.0
Available-for-sale securities - Fair Value 959.2 763.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 2.1 3.4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0.0 1.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0.0 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2.1 5.0
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.4 0.0
Available-for-sale securities - Amortized Cost 617.1 594.2
Available for Sale Securities - Unrealized Gains 19.9 23.9
Available-for-sale securities - Gross Unrealized Losses (0.6) (0.3)
Available-for-sale securities - Fair Value 636.4 617.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 61.5 12.9
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.2 0.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 8.1 10.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0.6 0.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 69.6 23.5
Other securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.1 0.1
Available-for-sale securities - Amortized Cost 538.0 533.3
Available for Sale Securities - Unrealized Gains 14.5 15.8
Available-for-sale securities - Gross Unrealized Losses (0.2) (0.2)
Available-for-sale securities - Fair Value 552.3 548.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 12.2 10.5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.1 0.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 4.9 8.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0.2 0.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value $ 17.1 $ 18.5
[1] Included within available-for-sale securities are corporate investments with fair values of $48.8 million and funds held for clients with fair values of $21,702.2 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.