Corporate Investments And Funds Held For Clients (Expected Maturities Of Available-For-Sale Securities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Corporate Investments And Funds Held For Clients [Abstract]
Due in one year or less	$ 1,850.8
Due after one year to two years	4,775.6
Due after two years to three years	3,837.1
Due after three years to four years	3,117.3
Due after four years	5,328.4
Total available-for-sale securities	$ 18,909.2