Investment Securities (Investments In Private Equity Funds Subject to Lock-Up Periods) (Details) (Private equity funds, USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Investment securities
Other long-term investments	$ 133.0
1-3 years
Investment securities
Other long-term investments	16.3
3-5 years
Investment securities
Other long-term investments	33.3
5-10 years
Investment securities
Other long-term investments	69.5
Greater than 10 years
Investment securities
Other long-term investments	$ 13.9