Organization and Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
Mar. 31, 2012 Subsidiary	Dec. 31, 2011	Dec. 31, 2011 Scenario, Previously Reported [Member]	Dec. 31, 2011 Restatement Adjustment [Member]
Organization and Basis of Presentation (Textual) [Abstract]
Cumulative effect adjustment of deferred tax assets				$ 64.8
Cumulative effect adjustment of deferred tax liabilities				64.8
Deferred tax assets	153.0	165.5	230.3
Non-current deferred tax liabilities	$ 443.3	$ 467.2	$ 532.0
Number of Subsidiaries	3

The current portion of the aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; after deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, are classified according to the expected reversal date of the temporary difference. An unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward is presented as a reduction of the related deferred tax asset.

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Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise separates deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, are classified according to the expected reversal date of the temporary difference.

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