Fair Value of Financial Instruments (Narrative) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Mar. 31, 2011	Sep. 30, 2011
Recently Adopted Accounting Guidance
Transfers of financial assets from level 3 to level 2	$ 0.2		$ 6.2
Fair Value Level Into Level 3 Transfers Amount		28.1	28.1
Transfers of financial assets from level II to level I	4.8		29.3
Fair Value Level One To Level Two Transfers Amount	$ 5.1		$ 22.3