Share-Based Compensation - Weighted Average Fair Value for Stock Options Granted (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Dividend yield	1.10%	1.10%
Volatility	24.50%	25.60%	26.10%
Risk-free interest rate	1.10%	1.50%	2.20%
Expected life (years)	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days
Weighted average fair value of options granted	$ 16.33	$ 15.40	$ 18.33
Intrinsic value of options exercised (in millions)	$ 97.9	$ 17.1	$ 27.5