Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2014 2.58% Senior Euro Notes, due June 2015	Mar. 31, 2014 4.5% Senior Notes, due December 2020	Dec. 06, 2010 4.5% Senior Notes, due December 2020	Mar. 31, 2014 4.2% Senior Notes, due December 2021	Dec. 09, 2011 4.2% Senior Notes, due December 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate		2.58%	4.50%	4.50%	4.20%	4.20%
Fair value of our revolving facility and senior debt	$ 801.1
Carrying value of our revolving facility and senior debt	$ 776.5