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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Unrecognized income tax benefits that would affect effective tax rate	$ 94.9	$ 71.1
Accrued or deferred taxes relating to uncertain income tax positions	27.5	23.0
Accrued interest and penalties relating to unrecognized tax benefits	$ 10.3	$ 7.6

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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