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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 | Sep. 30, 2015 | Jun. 30, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | $ (4.0) | $ (8.3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 3,749.6 | 5,318.3
Fair market value of securities in unrealized loss position less than 12 months | 2,709.2 | 4,242.9
Fair market value of securities in unrealized loss positions greater than 12 months | 1,040.4 | 1,075.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (27.6) | (48.6)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (23.6) | (40.3)
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (1.7) | (2.3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,016.2 | 2,631.6
Fair market value of securities in unrealized loss position less than 12 months | 1,803.0 | 2,403.5
Fair market value of securities in unrealized loss positions greater than 12 months | 213.2 | 228.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (22.1) | (29.6)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (20.4) | (27.3)
U.S. Treasury and direct obligations of U.S. government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (0.9) | (2.6)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 759.5 | 1,239.1
Fair market value of securities in unrealized loss position less than 12 months | 383.7 | 865.1
Fair market value of securities in unrealized loss positions greater than 12 months | 375.8 | 374.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2.2) | (9.8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1.3) | (7.2)
Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (1.2) | (2.9)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 734.9 | 1,050.4
Fair market value of securities in unrealized loss position less than 12 months | 310.5 | 606.8
Fair market value of securities in unrealized loss positions greater than 12 months | 424.4 | 443.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1.7) | (6.1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (0.5) | (3.2)
Canadian government obligations and Canadian government agency obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | 0.0 | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 55.6 | 85.8
Fair market value of securities in unrealized loss position less than 12 months | 55.6 | 85.8
Fair market value of securities in unrealized loss positions greater than 12 months | 0.0 | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (0.2) | (0.2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (0.2) | (0.2)
Canadian provincial bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | 0.0 | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 94.0 | 111.5
Fair market value of securities in unrealized loss position less than 12 months | 84.0 | 101.5
Fair market value of securities in unrealized loss positions greater than 12 months | 10.0 | 10.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (0.6) | (0.8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (0.6) | (0.8)
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (0.1) | (0.2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 45.8 | 149.6
Fair market value of securities in unrealized loss position less than 12 months | 42.4 | 143.6
Fair market value of securities in unrealized loss positions greater than 12 months | 3.4 | 6.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (0.5) | (1.4)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (0.4) | (1.2)
Other securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (0.1) | (0.3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 43.6 | 50.3
Fair market value of securities in unrealized loss position less than 12 months | 30.0 | 36.6
Fair market value of securities in unrealized loss positions greater than 12 months | 13.6 | 13.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (0.3) | (0.7)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (0.2) | $ (0.4)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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