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Corporate Investments And Funds Held For Clients (Available-For-Sale Securities That Have Been In An Unrealized Loss Position) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | $ (15.1) | $ (3.7)
Fair market value of securities in unrealized loss position less than 12 months | 3,063.9 | 982.1
Unrealized losses greater than 12 months | (45.9) | (34.4)
Fair market value of securities in unrealized loss positions greater than 12 months | 2,591.2 | 2,713.2
Total available for sale securities - Unrealized Loss | (61.0) | (38.1)
Total fair market value of securities in unrealized loss position | 5,655.1 | 3,695.3
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (7.3) | (0.9)
Fair market value of securities in unrealized loss position less than 12 months | 1,567.9 | 313.8
Unrealized losses greater than 12 months | (17.8) | (14.1)
Fair market value of securities in unrealized loss positions greater than 12 months | 948.6 | 1,026.0
Total available for sale securities - Unrealized Loss | (25.1) | (15.0)
Total fair market value of securities in unrealized loss position | 2,516.5 | 1,339.8
US Treasury and Government [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (1.7) | (0.3)
Fair market value of securities in unrealized loss position less than 12 months | 395.2 | 84.6
Unrealized losses greater than 12 months | (16.6) | (11.4)
Fair market value of securities in unrealized loss positions greater than 12 months | 937.8 | 944.8
Total available for sale securities - Unrealized Loss | (18.3) | (11.7)
Total fair market value of securities in unrealized loss position | 1,333.0 | 1,029.4
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (4.2) | (0.7)
Fair market value of securities in unrealized loss position less than 12 months | 856.0 | 325.4
Unrealized losses greater than 12 months | (8.8) | (6.2)
Fair market value of securities in unrealized loss positions greater than 12 months | 532.4 | 555.5
Total available for sale securities - Unrealized Loss | (13.0) | (6.9)
Total fair market value of securities in unrealized loss position | 1,388.4 | 880.9
Canadian Government Obligations And Canadian Government Agency Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (0.6) | (0.8)
Fair market value of securities in unrealized loss position less than 12 months | 106.5 | 127.2
Unrealized losses greater than 12 months | 0 | 0
Fair market value of securities in unrealized loss positions greater than 12 months | 8.1 | 0
Total available for sale securities - Unrealized Loss | (0.6) | (0.8)
Total fair market value of securities in unrealized loss position | 114.6 | 127.2
Canadian Provincial Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (1.2) | (0.9)
Fair market value of securities in unrealized loss position less than 12 months | 91.1 | 75.2
Unrealized losses greater than 12 months | (1.7) | (1.6)
Fair market value of securities in unrealized loss positions greater than 12 months | 106.0 | 118.6
Total available for sale securities - Unrealized Loss | (2.9) | (2.5)
Total fair market value of securities in unrealized loss position | 197.1 | 193.8
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | 0 | (0.1)
Fair market value of securities in unrealized loss position less than 12 months | 28.1 | 42.0
Unrealized losses greater than 12 months | (0.2) | (0.4)
Fair market value of securities in unrealized loss positions greater than 12 months | 13.3 | 22.6
Total available for sale securities - Unrealized Loss | (0.2) | (0.5)
Total fair market value of securities in unrealized loss position | 41.4 | 64.6
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (0.1) | 0
Fair market value of securities in unrealized loss position less than 12 months | 19.1 | 13.9
Unrealized losses greater than 12 months | (0.8) | (0.7)
Fair market value of securities in unrealized loss positions greater than 12 months | 45.0 | 45.7
Total available for sale securities - Unrealized Loss | (0.9) | (0.7)
Total fair market value of securities in unrealized loss position | $ 64.1 | $ 59.6

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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