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Client Funds/Obligations	3 Months Ended
Client Funds/Obligations	Mar. 31, 2013
Restricted Cash and Investments, Current [Abstract]
Client Funds/Obligations	Client Funds/Obligations The Company had $333.4 million and $398.9 million of funds held on behalf of clients at March 31, 2013 and December 31, 2012, respectively. Included in these amounts were $4.2 million and $11.8 million of fixed-income marketable securities at March 31, 2013 and December 31, 2012, respectively, which have been classified as available-for-sale investments. There were no significant unrealized gains or losses associated with these fixed-income securities at March 31, 2013 and December 31, 2012. During the three months ended March 31, 2013 and 2012, the Company received $29.7 million and $31.3 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 months ended March 31, 2013 and 2012.