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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 | Jun. 30, 2021 | Jun. 30, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | $ (77.6) | $ (0.7)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 6,331.3 | 63.0
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (0.1) | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 1.9 | 1.5
Total, Gross Unrealized Losses | (77.7) | (0.7)
Total, Fair Market Value | 6,333.2 | 64.5
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (38.5) | 0.0
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 3,539.6 | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | 0.0 | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 0.0 | 0.0
Total, Gross Unrealized Losses | (38.5) | 0.0
Total, Fair Market Value | 3,539.6 | 0.0
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (9.3) | 0.0
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 580.9 | 2.0
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | 0.0 | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 0.0 | 0.0
Total, Gross Unrealized Losses | (9.3) | 0.0
Total, Fair Market Value | 580.9 | 2.0
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (0.9) | (0.5)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 160.9 | 43.9
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | 0.0 | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 0.0 | 0.0
Total, Gross Unrealized Losses | (0.9) | (0.5)
Total, Fair Market Value | 160.9 | 43.9
Canadian government obligations and Canadian government agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (9.0) | 0.0
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 721.3 | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | 0.0 | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 0.0 | 0.0
Total, Gross Unrealized Losses | (9.0) | 0.0
Total, Fair Market Value | 721.3 | 0.0
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (9.4) | 0.0
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 749.7 | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | 0.0 | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 0.0 | 0.0
Total, Gross Unrealized Losses | (9.4) | 0.0
Total, Fair Market Value | 749.7 | 0.0
Canadian provincial bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (5.3) | 0.0
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 253.7 | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | 0.0 | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 0.0 | 0.0
Total, Gross Unrealized Losses | (5.3) | 0.0
Total, Fair Market Value | 253.7 | 0.0
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | 0.0 | 0.0
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 16.7 | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | 0.0 | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 0.0 | 1.5
Total, Gross Unrealized Losses | 0.0 | 0.0
Total, Fair Market Value | 16.7 | 1.5
Other securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (5.2) | (0.2)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 308.5 | 17.1
Securities in Unrealized Loss Position Greater Than 12 Months, Gross Unrealized Losses | (0.1) | 0.0
Securities in Unrealized Loss Position Greater Than 12 Months, Fair Market Value | 1.9 | 0.0
Total, Gross Unrealized Losses | (5.3) | (0.2)
Total, Fair Market Value | $ 310.4 | $ 17.1

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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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