Income Taxes Level 4 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Tax Contingency [Line Items]
Effective Income Tax Rate, Continuing Operations	32.40%	37.60%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	$ 6.3
Increase (Decrease) in Income Taxes	3.3
Unrecognized Tax Benefits	146.7
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	39.2
Unrecognized Tax Benefits, Period Increase (Decrease)	9.6
Unrecognized tax benefits, reduction of accrued interest	$ 2.6