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]
Income before income taxes	$ 2,024.4	$ 1,908.7	$ 1,308.4
Net tax expense	748.6	704.1	481.8
Cumulative undistributed earnings of foreign subsidiaries for which taxes has not been provided	53.7	43.7	40.6
Income taxes upon distribution of Undistributed foreign earnings	19.6
Increased effective tax rate	37.00%	36.90%	36.80%
Effective tax rate recognized in discontinued operations		35.50%	68.80%
Income tax (expense) benefit from discontinued operations	0	12.9	(1.8)
Net operating loss carryforwards	25.8
Operating loss carryforward expiration dates	between 2012 and 2031
Valuation allowance	19.2
Net current deferred tax asset	45.8	86.0
Net long-term deferred tax liability	546.5	448.9
Uncertain tax positions that would impact our effective tax rate if recognized	19.2
Interest expense	3.7	2.4	0.7
Accrued interest	$ 11.8	$ 8.1
Expiry date of latest statue for the examination of state income tax returns for 2007 and beyond	Dec. 31, 2015
Income Tax, Years under Examination	2008-2009