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Corporate Investments and Funds Held For Clients (Narrative) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]    
Earliest Corporate bond debt maturity date January 2019  
Latest corporate debt maturity date September 2028  
Available-for-sale securities - Fair Market Value $ 22,918.1 [1] $ 22,776.2 [2]
Earliest U.S. Treasury maturity date January 2019  
Latest U.S Treasury maturity date November 2028  
Client Fund obligation repayment period 1 year  
Client funds obligations $ 25,842.3 27,493.5
Client funds held in grantor trust $ 22,517.0 24,242.9
Client funds investments with original maturities ninety days or less  
Percentage of the available-for-sale securities were rated AAA Or AA 80.00%  
Federal Home Loan Banks    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value $ 1,791.3  
Federal Farm Credit Banks    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 661.5  
U.S. government agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 125.6  
Fixed Rate Credit Card    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 1,990.9  
Asset-Backed Auto Loan Receivables    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 1,862.5  
Asset-Backed Equipment Lease Receivable    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 469.5  
Rate Reduction    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 188.4  
Supranational Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 191.6  
Commercial Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 333.7  
Sovereign Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 97.0  
Level 1    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 0.0 0.0
Level 3    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value $ 0.0 $ 0.0
[1] Included within available-for-sale securities are corporate investments with fair values of $10.6 million and funds held for clients with fair values of $22,907.5 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 $10.5 million and funds held for clients with fair values of $22,765.7 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.