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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, 2020
Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months $ (1.4) $ (0.7)
Fair market value of securities in unrealized loss position less than 12 months 561.9 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 1.5 1.5
Total gross unrealized losses (1.4) (0.7)
Total fair market value 563.4 64.5
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months (0.4) 0.0
Fair market value of securities in unrealized loss position less than 12 months 151.5 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 (0.4) 0.0
Total fair market value 151.5 0.0
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months (0.2) (0.5)
Fair market value of securities in unrealized loss position less than 12 months 77.5 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 (0.2) (0.5)
Total fair market value 77.5 43.9
U.S. government agency 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 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 0.0 0.0
Total fair market value 0.0 2.0
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months (0.8) 0.0
Fair market value of securities in unrealized loss position less than 12 months 320.0 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 0.0 0.0
Total gross unrealized losses (0.8) 0.0
Total fair market value 320.0 0.0
Canadian government obligations and Canadian government agency obligations    
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 0.0 0.0
Total gross unrealized losses 0.0 0.0
Total fair market value 0.0 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 1.5 1.5
Total gross unrealized losses 0.0 0.0
Total fair market value 1.5 1.5
Canadian provincial bonds    
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 0.0 0.0
Total gross unrealized losses 0.0 0.0
Total fair market value 0.0 0.0
Other securities    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months 0.0 (0.2)
Fair market value of securities in unrealized loss position less than 12 months 12.9 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 0.0 (0.2)
Total fair market value $ 12.9 $ 17.1