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Corporate Investments And Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Jun. 30, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Money market securities and other cash equivalents - Amortized Cost | $ 3,385.4 |  | $ 2,773.7 |
Money market securities and other cash equivalents - Fair Value | 3,385.4 |  | 2,773.7 |
Available-for-sale securities - Amortized Cost | 20,007.6 |  | 19,832.1 |
Available-for-sale securities - Gross Unrealized Gains | 290.6 |  | 362.5 |
Available-for-sale securities - Gross Unrealized Losses | (61.0) |  | (38.1) |
Available-for-sale securities - Fair Value | 20,237.2 | [1] | 20,156.5 | [2]
Total corporate investments and funds held for clients - Amortized Cost | 23,393.0 |  | 22,605.8 |
Total corporate investments and funds held for clients - Gross Unrealized Gains | 290.6 |  | 362.5 |
Total corporate investments and funds held for clients - Gross Unrealized Losses | (61.0) |  | (38.1) |
Total corporate investments and funds held for clients - Fair Value | 23,622.6 |  | 22,930.2 |
Corporate Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 2,308.2 |  | 2,086.3 |
Funds Held For Clients [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Fair Value | 17,929.0 |  | 18,070.2 |
Corporate Bonds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 8,882.6 |  | 8,720.1 |
Available-for-sale securities - Gross Unrealized Gains | 134.6 |  | 171.1 |
Available-for-sale securities - Gross Unrealized Losses | (25.1) |  | (15.0) |
Available-for-sale securities - Fair Value | 8,992.1 | [1] | 8,876.2 | [2]
US Treasury and Government [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 6,008.2 |  | 6,051.4 |
Available-for-sale securities - Gross Unrealized Gains | 83.8 |  | 107.3 |
Available-for-sale securities - Gross Unrealized Losses | (18.3) |  | (11.7) |
Available-for-sale securities - Fair Value | 6,073.7 | [1] | 6,147.0 | [2]
Asset-Backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 2,063.7 |  | 1,822.6 |
Available-for-sale securities - Gross Unrealized Gains | 3.5 |  | 6.1 |
Available-for-sale securities - Gross Unrealized Losses | (13.0) |  | (6.9) |
Available-for-sale securities - Fair Value | 2,054.2 | [1] | 1,821.8 | [2]
Canadian Government Obligations And Canadian Government Agency Obligations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 985.8 |  | 1,031.4 |
Available-for-sale securities - Gross Unrealized Gains | 6.2 |  | 7.6 |
Available-for-sale securities - Gross Unrealized Losses | (0.6) |  | (0.8) |
Available-for-sale securities - Fair Value | 991.4 | [1] | 1,038.2 | [2]
Canadian Provincial Bonds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 728.0 |  | 747.7 |
Available-for-sale securities - Gross Unrealized Gains | 22.7 |  | 25.3 |
Available-for-sale securities - Gross Unrealized Losses | (2.9) |  | (2.5) |
Available-for-sale securities - Fair Value | 747.8 | [1] | 770.5 | [2]
Municipal Bonds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 522.2 |  | 543.3 |
Available-for-sale securities - Gross Unrealized Gains | 19.1 |  | 19.4 |
Available-for-sale securities - Gross Unrealized Losses | (0.2) |  | (0.5) |
Available-for-sale securities - Fair Value | 541.1 | [1] | 562.2 | [2]
Other Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities - Amortized Cost | 817.1 |  | 915.6 |
Available-for-sale securities - Gross Unrealized Gains | 20.7 |  | 25.7 |
Available-for-sale securities - Gross Unrealized Losses | (0.9) |  | (0.7) |
Available-for-sale securities - Fair Value | $ 836.9 | [1] | $ 940.6 | [2]
[1] | Included within available-for-sale securities are corporate investments with fair values of $2,308.2 million and funds held for clients with fair values of $17,929.0 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. All available-for-sale securities were included in Level 2.

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