Short-Term Financing	9 Months Ended
Mar. 31, 2015
Short-Term Financing [Abstract]
Short-Term Financing	Short-term Financing The Company has a $2.25 billion, 364-day credit agreement with a group of lenders that matures in June 2015. In addition, the Company has a five-year $2.0 billion credit facility and a five-year $3.25 billion credit facility maturing in June 2018 and June 2019, respectively, each with an accordion feature under which the aggregate commitment can be increased by $500.0 million, subject to the availability of additional commitments. The interest rate applicable to committed borrowings is tied to LIBOR, the effective federal funds rate, or the prime rate depending on the notification provided by the Company to the syndicated financial institutions prior to borrowing. The Company is also required to pay facility fees on the credit agreements. The primary uses of the credit facilities are to provide liquidity to the commercial paper program and funding for general corporate purposes, if necessary. The Company had no borrowings through March 31, 2015 under the credit agreements. The Company’s U.S. short-term funding requirements related to client funds are sometimes obtained through a commercial paper program, which provides for the issuance of up to $7.5 billion in aggregate maturity value of commercial paper, rather than liquidating previously-collected client funds that have already been invested in available-for-sale securities. The Company’s commercial paper program is rated A-1+ by Standard & Poor’s and Prime-1 by Moody’s. These ratings denote the highest quality commercial paper securities. Maturities of commercial paper can range from overnight to up to 364 days. At March 31, 2015, the Company had no commercial paper outstanding. At June 30, 2014, the Company had $2,173.0 million of commercial paper outstanding, which was repaid on July 1, 2014. For the three months ended March 31, 2015 and 2014, the Company's average borrowings were $1.0 billion and $0.7 billion, respectively, at weighted average interest rates of 0.1%. For the nine months ended March 31, 2015 and 2014, the Company's average borrowings were $2.4 billion at weighted average interest rates of 0.1%. The weighted average maturity of the Company’s commercial paper issued during the three and nine months ended March 31, 2015 approximated one and two days, respectively. The Company’s U.S. and Canadian short-term funding requirements related to client funds obligations are sometimes obtained on a secured basis through the use of reverse repurchase agreements, which are collateralized principally by government and government agency securities, rather than liquidating previously-collected client funds that have already been invested in available-for-sale securities. These agreements generally have terms ranging from overnight to up to five business days. At March 31, 2015 and June 30, 2014, the Company had no obligations outstanding related to reverse repurchase agreements. For the three months ended March 31, 2015 and 2014, the Company had average outstanding balances under reverse repurchase agreements of $93.0 million and $162.1 million, respectively, at weighted average interest rates of 0.7% and 0.9%, respectively. For the nine months ended March 31, 2015 and 2014, the Company had average outstanding balances under reverse repurchase agreements of $423.2 million and $366.0 million, respectively, at weighted average interest rates of 0.5% and 0.6%, respectively. In addition, the Company has $3.25 billion available on a committed basis under the U.S. reverse repurchase agreements.

Short-term Financing

The Company has a $2.25 billion, 364-day credit agreement with a group of lenders that matures in June 2015. In addition, the Company has a five-year $2.0 billion credit facility and a five-year $3.25 billion credit facility maturing in June 2018 and June 2019, respectively, each with an accordion feature under which the aggregate commitment can be increased by $500.0 million, subject to the availability of additional commitments. The interest rate applicable to committed borrowings is tied to LIBOR, the effective federal funds rate, or the prime rate depending on the notification provided by the Company to the syndicated financial institutions prior to borrowing. The Company is also required to pay facility fees on the credit agreements. The primary uses of the credit facilities are to provide liquidity to the commercial paper program and funding for general corporate purposes, if necessary. The Company had no borrowings through March 31, 2015 under the credit agreements.

The Company’s U.S. short-term funding requirements related to client funds are sometimes obtained through a commercial paper program, which provides for the issuance of up to $7.5 billion in aggregate maturity value of commercial paper, rather than liquidating previously-collected client funds that have already been invested in available-for-sale securities. The Company’s commercial paper program is rated A-1+ by Standard & Poor’s and Prime-1 by Moody’s. These ratings denote the highest quality commercial paper securities. Maturities of commercial paper can range from overnight to up to 364 days. At March 31, 2015, the Company had no commercial paper outstanding. At June 30, 2014, the Company had $2,173.0 million of commercial paper outstanding, which was repaid on July 1, 2014. For the three months ended March 31, 2015 and 2014, the Company's average borrowings were $1.0 billion and $0.7 billion, respectively, at weighted average interest rates of 0.1%. For the nine months ended March 31, 2015 and 2014, the Company's average borrowings were $2.4 billion at weighted average interest rates of 0.1%. The weighted average maturity of the Company’s commercial paper issued during the three and nine months ended March 31, 2015 approximated one and two days, respectively.

The Company’s U.S. and Canadian short-term funding requirements related to client funds obligations are sometimes obtained on a secured basis through the use of reverse repurchase agreements, which are collateralized principally by government and government agency securities, rather than liquidating previously-collected client funds that have already been invested in available-for-sale securities. These agreements generally have terms ranging from overnight to up to five business days. At March 31, 2015 and June 30, 2014, the Company had no obligations outstanding related to reverse repurchase agreements. For the three months ended March 31, 2015 and 2014, the Company had average outstanding balances under reverse repurchase agreements of $93.0 million and $162.1 million, respectively, at weighted average interest rates of 0.7% and 0.9%, respectively. For the nine months ended March 31, 2015 and 2014, the Company had average outstanding balances under reverse repurchase agreements of $423.2 million and $366.0 million, respectively, at weighted average interest rates of 0.5% and 0.6%, respectively. In addition, the Company has $3.25 billion available on a committed basis under the U.S. reverse repurchase agreements.