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Corporate Investments and Funds Held For Clients (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]    
Earliest Corporate bond debt maturity date October 2019  
Latest corporate debt maturity date September 2029  
Available-for-sale securities - Fair Market Value $ 24,646.0 [1] $ 24,859.1 [2]
Earliest U.S. Treasury maturity date November 2019  
Latest U.S Treasury maturity date January 2029  
Client Fund obligation repayment period 1 year  
Client funds obligations $ 21,011.4 29,144.5
Client funds held in grantor trust $ 18,898.2 26,648.0
Client funds investments with original maturities ninety days or less  
Percentage of the available-for-sale securities were rated AAA Or AA 79.00%  
Federal Home Loan Banks    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value $ 1,266.5  
Federal Farm Credit Banks    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 661.2  
U.S. government agency securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 108.5  
Fixed Rate Credit Card    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 1,578.7  
Asset-Backed Auto Loan Receivables    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 2,157.9  
Asset-Backed Equipment Lease Receivable    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 481.8  
Rate Reduction    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 149.7  
Supranational Bonds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 188.1  
Commercial Mortgage Backed Securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 640.3  
Sovereign Bonds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 89.5  
Fair Value, Inputs, Level 1 [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 0.0 0.0
Fair Value, Inputs, Level 3 [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities - Fair Market Value 0.0 0.0
Current [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Restricted 1,168.6 5,013.9
Non-current [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Restricted $ 19,356.3 $ 19,573.3
[1] Included within available-for-sale securities are corporate investments with fair values of $4,121.1 million and funds held for clients with fair values of $20,524.9 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.
[2] Included within available-for-sale securities are corporate investments with fair values of $271.9 million and funds held for clients with fair values of $24,587.2 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.