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Stockholders' Equity (Deficit) Accumulated Other Comprehensive Income and Redeemable Noncontrolling Interest - Changes in Accumulated Other Comprehensive Income (loss) by Component (Detail) (USD $) In Millions, unless otherwise specified			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Foreign Currency Translation [Member]	Sep. 30, 2013 Benefit Plan Liabilities [Member]	Sep. 30, 2013 Unrealized Gain (Loss) on Available- For-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) net of tax, beginning balance	$ (255.2)	$ (253.7)	$ (5.4)	$ (251.6)	$ 3.3
Other comprehensive income (loss) before reclassifications			(6.8)		1.8
Reclassification from accumulated other comprehensive income, period net of tax				3.5
Net current-period other comprehensive income (loss)			(6.8)	3.5	1.8
Accumulated other comprehensive income (loss) net of tax, ending balance	$ (255.2)	$ (253.7)	$ (12.2)	$ (248.1)	$ 5.1

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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