Share Plans - Stock Option Activity (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Shares
Beginning balance	8.4
Granted	1.0
Exercised	(2.9)
Forfeited	(0.2)
Expired	(0.1)
Ending balance	6.2
Options exercisable	4.7
Options expected to vest at end of period	1.5
Weighted Average Exercise Price
Beginning balance (USD per share)	$ 32.13
Granted (USD per share)	$ 50.83
Exercised (USD per share)	$ 30.84
Forfeited (USD per share)	$ 37.25
Expired (USD per share)	$ 28.82
Ending Balance (USD per share)	$ 35.53
Options exercisable at end of period (USD per share)	$ 32.78
Options expected to vest at end of period (USD per share)	$ 44.27
Weighted Average Remaining Contractual Life
Ending balance	5 years 7 months
Options exercisable at end of period	4 years 8 months 10 days
Options expected to vest at end of period	8 years 6 months
Aggregate Intrinsic value
Balance at end of period	$ 255.3
Options exercisable at end of period	205.8
Options expected to vest at end of period	$ 48.0

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Net number of share options (or share units) granted during the period.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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