Income Taxes - Schedule of Current and Deferred Income Tax Assets (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Current Income Tax Assets	$ 37.4	$ 39.3
Deferred Income Tax Assets	7.5	9.4
Valuation Allowance for State Income Taxes	(6.2)	(9.1)
Current and Deferred Income Tax Assets	$ 38.7	$ 39.6