Changes in Projected Benefit Obligation Amount (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits, U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligation at Beginning of Year	$ 1,352.7	$ 1,123.6
Service Cost	42.7	36.5	29.6
Interest Cost	77.6	71.1	64.0
Plan Participant Contributions	0	0
Actuarial (Gain) Loss	138.4	148.6
Benefits and Expenses Paid	(31.6)	(27.1)
Change in Foreign Exchange Rates	0	0
Benefit Obligation at End of Year	1,579.8	1,352.7	1,123.6
Accumulated Benefit Obligation at December 31	1,462.2	1,243.6
Fair Value of Plan Assets at Beginning of Year	1,179.6	888.5
Actual Return on Plan Assets	18.5	146.3
Employer Contributions	4.3	171.9
Plan Participant Contributions	0	0
Benefits and Expenses Paid	(31.6)	(27.1)
Change in Foreign Exchange Rates	0	0
Fair Value of Plan Assets at End of Year	1,170.8	1,179.6	888.5
Underfunded (Overfunded) Status	409.0	173.1
Pension Benefits, Non U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligation at Beginning of Year	152.9	173.5
Service Cost	4.8	4.9	4.9
Interest Cost	8.8	9.5	8.7
Plan Participant Contributions	0	0
Actuarial (Gain) Loss	9.3	(25.3)
Benefits and Expenses Paid	(4.1)	(3.6)
Change in Foreign Exchange Rates	(1.3)	(6.1)
Benefit Obligation at End of Year	170.4	152.9	173.5
Accumulated Benefit Obligation at December 31	160.9	141.7
Fair Value of Plan Assets at Beginning of Year	176.0	160.8
Actual Return on Plan Assets	12.5	19.1
Employer Contributions	4.7	5.0
Plan Participant Contributions	0	0
Benefits and Expenses Paid	(4.1)	(3.6)
Change in Foreign Exchange Rates	(1.1)	(5.3)
Fair Value of Plan Assets at End of Year	188.0	176.0	160.8
Underfunded (Overfunded) Status	(17.6)	(23.1)
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligation at Beginning of Year	185.1	190.6
Service Cost	1.9	2.6	2.9
Interest Cost	10.0	10.8	11.3
Plan Participant Contributions	3.4	3.2
Actuarial (Gain) Loss	5.6	(7.2)
Benefits and Expenses Paid	(15.1)	(14.9)
Change in Foreign Exchange Rates	0	0
Benefit Obligation at End of Year	190.9	185.1	190.6
Fair Value of Plan Assets at Beginning of Year	11.9	11.9
Actual Return on Plan Assets	0.2	0.4
Employer Contributions	11.3	11.3
Plan Participant Contributions	3.4	3.2
Benefits and Expenses Paid	(15.1)	(14.9)
Change in Foreign Exchange Rates	0	0
Fair Value of Plan Assets at End of Year	11.7	11.9	11.9
Underfunded (Overfunded) Status	$ 179.2	$ 173.2