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Client Funds/Obligations	9 Months Ended
Client Funds/Obligations	Sep. 30, 2013
Restricted Cash and Investments, Current [Abstract]
Client Funds/Obligations	Client Funds/Obligations The Company had $250.4 million and $398.9 million of funds held on behalf of clients at September 30, 2013 and December 31, 2012, respectively. There were no fixed-income marketable securities included within the Funds held on behalf of clients at September 30, 2013. The December 31, 2012 balance includes $11.8 million of fixed-income marketable securities which have been classified as available-for-sale investments. There were no significant unrealized gains or losses associated with these fixed-income securities at September 30, 2013 and December 31, 2012. During the nine months ended September 30, 2013 and 2012, the Company received $20.2 million and $101.2 million, respectively, of proceeds from the sales/maturities of investments in available-for-sale securities held to satisfy client funds obligations. Gross realized gains and gross realized losses associated with the sales/maturities of these available-for-sale securities held to satisfy client funds obligations were not significant during both the three and nine months ended September 30, 2013 and 2012.