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Income Taxes - Deferred Tax Assets and Liabilities as Presented in Consolidated Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Deferred income taxes (current)	$ 114.9	$ 170.5
Liabilities held for sale (non-current)	51.9	66.2
Deferred income taxes (non-current)	4,334.1	5,131.9
Net deferred tax liability	$ 4,271.1	$ 5,027.6

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences from the entity's basis in a discontinued operation.

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