Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income Taxes (Textuals)
Effective tax rate	49.30%	40.90%	41.80%	41.80%
Income taxes paid, net of refunds received			$ 107.4	$ 284.4
Accrued liability for penalties	0.8		0.8
Accrued liability for interest related to uncertain tax positions and penalties	106.0		106.0
Potential cash taxes related to an exchange of partnership interests that the IRS issued a formal disallowance	156.2		156.2
Accrued interest related to an exchange of partnership interests that the IRS issued a formal disallowance	78.0		78.0
IRS asserted penalty, percentage of the additional income tax due	20.00%		20.00%
Income tax examination penalties and interest asserted by taxing authority	$ 49.8		$ 49.8

Income Taxes (Textuals) [Abstract].

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Income Tax Examination Penalties Additional Percent On Income.

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Income Tax Examination Penalties And Interest Asserted By Taxing Authority.

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The amount of estimated interest accrued as of the balance sheet date arising from income tax examinations.

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The estimated range of reasonably possible losses resulting from an adverse position taken by a taxing authority.

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This element represents the amount of statutory penalties accrued as of the date of the statement of financial position 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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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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