Change in Fair Value of Plan Assets and Funded Status for Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value of plan assets - ending	$ 355.7	[1]	$ 298.7	[1]
Funded status of the plans, December 31	(129.3)		(123.2)
Pension Plans, Defined Benefit
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Service cost	27.8		26.1		24.6
Interest cost	19.5		19.0		18.9
Actuarial loss	(11.0)		(8.4)		(6.9)
Funded status of the plans, December 31	(129.3)		(123.2)
Pension Plans, Defined Benefit | Change In Benefit Obligation
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Benefit obligation - beginning	421.9		377.0
Service cost	28.4		26.8
Interest cost	19.5		19.0
Actuarial loss	37.2		23.8
Benefits paid	(23.1)		(22.2)
Currency/other	1.1		(2.5)
Benefit obligation - ending	485.0		421.9
Pension Plans, Defined Benefit | Change In Fair Value Of Plan Assets And Funded Status
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value of plan assets - beginning	298.7		281.6
Actual return on plan assets	38.2		5.4
Company contributions	40.3		32.9
Benefits paid	(23.1)		(22.2)
Currency/other	1.6		1.0
Fair value of plan assets - ending	$ 355.7		$ 298.7

[1] There were no assets categorized as Level 3 at December 31, 2012 and 2011, respectively.