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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, 2020 | Jun. 30, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months | $ (2.2) | $ (0.7)
Fair market value of securities in unrealized loss position less than 12 months | 887.2 | 63.0
Unrealized losses greater than 12 months | 0.0 | 0.0
Fair market value of securities in unrealized loss positions greater than 12 months | 1.4 | 1.5
Total gross unrealized losses | (2.2) | (0.7)
Total fair market value | 888.6 | 64.5
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months | (0.9) | 0.0
Fair market value of securities in unrealized loss position less than 12 months | 379.3 | 0.0
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 | (0.9) | 0.0
Total fair market value | 379.3 | 0.0
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months | 0.0 | (0.5)
Fair market value of securities in unrealized loss position less than 12 months | 3.2 | 43.9
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 | 0.0 | (0.5)
Total fair market value | 3.2 | 43.9
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months | (0.1) | 0.0
Fair market value of securities in unrealized loss position less than 12 months | 14.1 | 2.0
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 | (0.1) | 0.0
Total fair market value | 14.1 | 2.0
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months | (0.9) | 0.0
Fair market value of securities in unrealized loss position less than 12 months | 348.6 | 0.0
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 | (0.9) | 0.0
Total fair market value | 348.6 | 0.0
Canadian government obligations and Canadian government agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months | (0.1) | 0.0
Fair market value of securities in unrealized loss position less than 12 months | 68.1 | 0.0
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 | (0.1) | 0.0
Total fair market value | 68.1 | 0.0
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months | 0.0 | 0.0
Fair market value of securities in unrealized loss position less than 12 months | 0.0 | 0.0
Unrealized losses greater than 12 months | 0.0 | 0.0
Fair market value of securities in unrealized loss positions greater than 12 months | 1.4 | 1.5
Total gross unrealized losses | 0.0 | 0.0
Total fair market value | 1.4 | 1.5
Canadian provincial bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months | (0.1) | 0.0
Fair market value of securities in unrealized loss position less than 12 months | 45.7 | 0.0
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 | (0.1) | 0.0
Total fair market value | 45.7 | 0.0
Other securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months | (0.1) | (0.2)
Fair market value of securities in unrealized loss position less than 12 months | 28.2 | 17.1
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 | (0.1) | (0.2)
Total fair market value | $ 28.2 | $ 17.1

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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