Accumulated Other Comprehensive Income - Changes in Components of Other Comprehensive Income, Net of Tax (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 Cash Flow Hedges [Member]	Sep. 30, 2013 Unrealized Gains on Securities [Member]	Sep. 30, 2013 Defined Benefit Plan Items [Member]
Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income, Beginning Balance	$ 324.8	$ 343.9	$ 445.5	$ 4.1	$ 0.4	$ (106.1)
OCI before reclassifications			(51.4)	24.5	(0.1)
Reclassifications				(2.0)		9.9
Accumulated Other Comprehensive Income, Ending Balance	$ 324.8	$ 343.9	$ 394.1	$ 26.6	$ 0.3	$ (96.2)

- Definition

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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