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Corporate Investments and Funds Held For Clients (Narrative) (Details) - USD ($)
$ in Millions
 6 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Schedule of Available-for-sale Securities [Line Items]    
Earliest Corporate bond debt maturity date January 2018  
Latest corporate debt maturity date March 2026  
Available-for-sale securities - Fair Market Value $ 22,375.5 [1] $ 21,901.1 [2]
Earliest U.S. Treasury maturity date June 2018  
Latest U.S Treasury maturity date November 2025  
Length of shortest cash flow of residential mortgages used as collateral for companies mortgage backed securities (in years) 15 years  
Length of longest cash flow of residential mortgages used as collateral for company's mortgage backed securities (in years) 30 years  
Client Fund obligation repayment period 1 year  
Client funds obligations $ 34,508.1 27,189.4
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 $ 2,058.8  
Federal Farm Credit Banks    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 603.0  
U.S. government agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 154.1  
Fixed Rate Credit Card    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 2,183.6  
Asset-Backed Auto Loan Receivables    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 1,581.6  
Asset-Backed Equipment Lease Receivable    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 439.6  
Rate Reduction    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 222.9  
Supranational Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 137.8  
Commercial Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 147.0  
Sovereign Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 110.8  
Residential Mortgage-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 87.2  
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 $22,364.9 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 $10.8 million and funds held for clients with fair values of $21,890.3 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.