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Client Funds/Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Client funds
Funds held on behalf of clients	$ 398.9	$ 272.6
Available-for-sale investments
Client funds
Proceeds from the sales/maturities of investments, held to satisfy client funds obligations	145.3	107.1	48.4
Available-for-sale investments \| Fixed-income securities
Client funds
Funds held on behalf of clients	$ 11.8	$ 14.3

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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