Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Deferred tax assets			$ 286.4
Period of cumulative income impacting valuation allowance consideration	3 years
Deferred tax assets, net		63.1
Income tax benefit attributable to adjustment of deferred tax		$ 63.1