Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes (Textual) [Abstract]
Net operating loss and tax credit carryforward benefits, approximately	$ 125
Expiration Period of net operating loss and tax credit carryforward benefits	2012 through 2031
Valuation allowance to offset the deferred tax asset	55	45	55
Net decrease in total valuation allowance	9.7	(9.8)	4.2
Tax positions for which deductibility is highly certain but timing of deductibility is uncertain	0.8
Total unrecognized benefits, if recognized would Impact effective tax rate	215.5	203.9
Adjustments to income tax expense for interest and penalties, Gain (Loss)	20.1	29.0	9.5
Payment for accrued interest and penalties	99.3	119.4
Unrecognized deferred tax or foreign withholding tax	852.9
Enactment of health care reform legislation charge		$ 10