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Debt
6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]  
Debt

6.  Debt

In May of 2013, the Company completed a public offering of $500 million aggregate principal amount of 2.6% senior notes due May 15, 2023 and $500 million aggregate principal amount of 4.1% senior notes due May 15, 2043. The Company received net proceeds of approximately $983 million, after deducting the underwriters’ discounts and commissions and offering expenses of $17 million, which will be amortized over the life of the notes. The proceeds for this offering are expected to be used for general corporate purposes.