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Investments - Fair Values and Gross Unrealized Losses for all Available-for-Sale Securities in Unrealized Loss Position Deemed to be Temporary (Detail) (Corporate debt securities [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Unrealized Losses, Fair Value	$ 154.0	$ 144.2
Available-for-sale Securities, Unrealized Losses	$ (0.2)	$ (0.1)

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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