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)
Income taxes paid	$ 236.4	$ 330.6	$ 268.5
Maturity period for net operating loss carryovers	1 to 20 years
Valuation allowances for net operating loss carryovers	14.6	14.6
Maturity period for tax credit carryovers	1 to 10 years
Valuation allowances for certain tax credit carryovers	15.3	17.5
Capital loss carryover	4.0	0
Capital loss carryover expiry period	5 years
Valuation allowances for potential capital losses	6.4	7.8
Unremitted earnings of foreign subsidiaries	2,551
Unrecognized tax benefits, if recognized, would affect the effective tax rate	132.7
Unrecognized tax benefits income tax penalties and interest expense recognized	(12.1)	(5.8)	5.7
Recognized liability for interest and penalties	$ 10.7	$ 22.8	$ 28.6
Examining period for state income tax returns	3 to 5 years
Foreign jurisdictions statutes of limitations period	3 to 5 years
State Examination Period After Notification	Up to 1 year