Fair Value Of Assets And Liabilities (Narrative) (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended
	Mar. 31, 2014 contract	Dec. 31, 2013 contract	Mar. 31, 2014 Future [Member]	Dec. 31, 2013 Future [Member]	Mar. 31, 2014 Long [Member] Put Option [Member]	Mar. 31, 2013 Long [Member] Put Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instrument, Maximum Exposure, Undiscounted						$ 1.8
Derivative, Loss on Derivative					0	0.4
Number of futures contracts (as shown)	2	10
Notional value of futures contracts			0.3	1.4
Other debt securities	6.3	6.3
Note payable	$ 0.3	$ 0.3