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Client Funds/Obligations	3 Months Ended
Client Funds/Obligations	Mar. 31, 2014
Restricted Cash and Investments, Current [Abstract]
Client Funds/Obligations	Client Funds/Obligations The Company had $303.4 million and $316.3 million of funds held on behalf of clients at March 31, 2014 and December 31, 2013, respectively. During the three months ended March 31, 2014, the Company received no proceeds from the sales/ maturities of investments in available-for-sale securities held to satisfy client funds obligations. During the three months ended March 31, 2013, the Company received $29.7 million 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 available-for-sale securities held to satisfy client funds obligations were not significant during both the three months ended March 31, 2014 and 2013.