Investment Securities (Investments In Private Equity Funds Subject to Lock-Up Periods) (Details) (Private equity funds, USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Investment securities
Other long-term investments	$ 124.9
1-3 years
Investment securities
Other long-term investments	6.5
3-5 years
Investment securities
Other long-term investments	29.5
5-10 years
Investment securities
Other long-term investments	75.7
Greater than 10 years
Investment securities
Other long-term investments	$ 13.2