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Client Funds/Obligations (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Available-for-sale investments	Mar. 31, 2012 Available-for-sale investments	Mar. 31, 2013 Available-for-sale investments Fixed-income securities	Dec. 31, 2012 Available-for-sale investments Fixed-income securities
Client funds
Funds held on behalf of clients	$ 333.4	$ 398.9			$ 4.2	$ 11.8
Proceeds from the sales/maturities of investments, held to satisfy client funds obligations			$ 29.7	$ 31.3

The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.

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