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Client Funds/Obligations (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Available-for-sale investments
Jun. 30, 2012
Available-for-sale investments
Jun. 30, 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 $ 336.2 $ 398.9     $ 1.1 $ 11.8
Proceeds from the sales/maturities of investments, held to satisfy client funds obligations     $ 19.0 $ 61.7