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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 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | $ (81.9) | $ (73.5)
Fair market value of securities in unrealized loss position less than 12 months | 10,372.8 | 8,915.3
Unrealized losses greater than 12 months | (69.3) | (0.3)
Fair market value of securities in unrealized loss positions greater than 12 months | 4,004.3 | 29.8
Total gross unrealized losses | (151.2) | (73.8)
Total fair market value | 14,377.1 | 8,945.1
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (18.3) | (22.0)
Fair market value of securities in unrealized loss position less than 12 months | 3,437.6 | 2,619.9
Unrealized losses greater than 12 months | (21.4) | 0.0
Fair market value of securities in unrealized loss positions greater than 12 months | 1,186.2 | 7.4
Total gross unrealized losses | (39.7) | (22.0)
Total fair market value | 4,623.8 | 2,627.3
Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (10.8) | (8.5)
Fair market value of securities in unrealized loss position less than 12 months | 2,463.5 | 1,916.1
Unrealized losses greater than 12 months | (11.2) | (0.1)
Fair market value of securities in unrealized loss positions greater than 12 months | 1,065.1 | 11.3
Total gross unrealized losses | (22.0) | (8.6)
Total fair market value | 3,528.6 | 1,927.4
U.S. government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (9.6) | (13.4)
Fair market value of securities in unrealized loss position less than 12 months | 1,390.0 | 1,935.3
Unrealized losses greater than 12 months | (13.2) | 0.0
Fair market value of securities in unrealized loss positions greater than 12 months | 656.1 | 0.0
Total gross unrealized losses | (22.8) | (13.4)
Total fair market value | 2,046.1 | 1,935.3
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (17.1) | (14.3)
Fair market value of securities in unrealized loss position less than 12 months | 1,412.9 | 1,317.8
Unrealized losses greater than 12 months | (21.5) | 0.0
Fair market value of securities in unrealized loss positions greater than 12 months | 982.1 | 1.0
Total gross unrealized losses | (38.6) | (14.3)
Total fair market value | 2,395.0 | 1,318.8
Canadian government obligations and Canadian government agency obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (20.1) | (11.4)
Fair market value of securities in unrealized loss position less than 12 months | 895.3 | 699.6
Unrealized losses greater than 12 months | 0.0 | 0.0
Fair market value of securities in unrealized loss positions greater than 12 months | 0.0 | 0.0
Total gross unrealized losses | (20.1) | (11.4)
Total fair market value | 895.3 | 699.6
Canadian provincial bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (2.7) | (1.4)
Fair market value of securities in unrealized loss position less than 12 months | 315.1 | 179.8
Unrealized losses greater than 12 months | (0.6) | 0.0
Fair market value of securities in unrealized loss positions greater than 12 months | 55.4 | 0.0
Total gross unrealized losses | (3.3) | (1.4)
Total fair market value | 370.5 | 179.8
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (1.4) | (1.2)
Fair market value of securities in unrealized loss position less than 12 months | 189.2 | 98.8
Unrealized losses greater than 12 months | (0.6) | (0.1)
Fair market value of securities in unrealized loss positions greater than 12 months | 17.8 | 1.2
Total gross unrealized losses | (2.0) | (1.3)
Total fair market value | 207.0 | 100.0
Other securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months | (1.9) | (1.3)
Fair market value of securities in unrealized loss position less than 12 months | 269.2 | 148.0
Unrealized losses greater than 12 months | (0.8) | (0.1)
Fair market value of securities in unrealized loss positions greater than 12 months | 41.6 | 8.9
Total gross unrealized losses | (2.7) | (1.4)
Total fair market value | $ 310.8 | $ 156.9

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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=73527792&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=73527792&loc=d3e27337-111563 + Details
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