Investment Securities (Other Long-Term Investments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Hedge funds
Investment securities
Number of Investments Held	15
Trading Securities, Other	$ 120.8
Private equity funds
Investment securities
Number of Investments Held	39
Trading Securities, Other	118.2
Total hedge and private equity funds included in other long-term investments
Investment securities
Other Long-term Investments Largest Single Investment	18.3	16.0
Trading Securities, Other	$ 239.0	$ 239.8