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Income Taxes (Deferred Tax Assets (Liabilities) Classification) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Prepaid expenses and other	$ 319.0	$ 347.4
Other assets	759.5	544.3
Total deferred tax assets	1,078.5	891.7
Income taxes	(19.3)	(3.4)
Long-term income taxes	(24.5)	(30.0)
Total deferred tax liabilities	(43.8)	(33.4)
Net deferred tax assets	$ 1,034.7	$ 858.3

For entities that net deferred tax assets and tax liabilities, represents the unclassified net amount of deferred tax assets and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities. A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods.

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