Amounts Recognized in Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated Other Comprehensive Income (Loss)at End of Year	$ 444.1	$ 318.6
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated Other Comprehensive Income (Loss) at Beginning of Year	(323.2)	(294.1)
Net Actuarial Loss - Amortization	31.9	29.8
Net Actuarial Loss - All Other Changes	(207.5)	(72.8)
Prior Service Credit Amortization	(0.5)	(0.5)
Change in Deferred Income Tax Asset	61.7	14.4
Accumulated Other Comprehensive Income (Loss)at End of Year	(437.6)	(323.2)
Pension Benefits, Non U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated Other Comprehensive Income (Loss) at Beginning of Year	(10.7)	(39.5)
Net Actuarial Loss - Amortization	0	2.4
Net Actuarial Loss - All Other Changes	(8.7)	36.1
Prior Service Credit Amortization	0	0
Change in Deferred Income Tax Asset	2.2	(9.7)
Accumulated Other Comprehensive Income (Loss)at End of Year	(17.2)	(10.7)
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated Other Comprehensive Income (Loss) at Beginning of Year	15.3	2.9
Net Actuarial Loss - Amortization	0	0
Net Actuarial Loss - All Other Changes	(5.5)	7.0
Prior Service Credit Amortization	(2.6)	(2.6)
Change in Deferred Income Tax Asset	3.5	8.0
Accumulated Other Comprehensive Income (Loss)at End of Year	$ 10.7	$ 15.3