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Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Taxes (Textual) [Abstract]
Gross unrecognized tax benefits	$ 26.5		$ 30.4
Unrecognized tax benefits that would impact effective tax rate	26.5
Lower range of gross unrecognized tax benefits balance may decrease within the next twelve months	0
Higher range of gross unrecognized tax benefits balance may decrease within the next twelve months	14.0
Benefit from a reduction in interest payable	0.2
Interest expense		0.1
Liability for interest	1.2		1.4
Penalties associated with uncertain tax positions	$ 0	$ 0

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Reduction in interest payable.

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The amount of estimated interest recognized in the period arising from income tax examinations.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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The estimated lower bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

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The estimated upper bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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This element represents the recognized expense for the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties or, if not recognizing the expense in the period in which the tax return was initially filed, the expense is generally recognized in the period in which the enterprise's judgment about meeting the minimum statutory threshold changes.

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This element represents the amount of interest expense accrued as of the date of the statement of financial position 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.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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