Fair Value Of Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jan. 18, 2012	Dec. 31, 2011
Recently Adopted Accounting Guidance
Fair Value Level Into Level 3 Transfers Amount	$ 2.5	$ 2.7
Transfers of financial assets from level 2 to level 1		1.8
Fair Value Level One To Level Two Transfers Amount	13.7	14.1
Commitments Investments In Affiliated And Unaffiliated Partnerships	3.4	3.4		4.0
Stated interest rate	6.70%	6.70%	6.70%
Transfers of financial assets from Level 3		$ 4.3