Amounts Recognized in Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	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 Beginning of Year	$ 444.1
Change in Unrecognized Pension and Postretirement Benefit Cost Tax Expense	68.0	67.4	12.7
Accumulated Other Comprehensive Income (Loss)at End of Year	574.5	444.1
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	(437.6)	(323.2)
Net Actuarial Loss - Amortization	45.9	31.9
Net Actuarial Loss - Curtailment	0	0
Net Actuarial Loss - All Other Changes	(218.2)	(207.5)
Prior Service Credit - Amortization	(0.4)	(0.5)	(0.5)
Prior Service Credit - Plan Amendment	0	0
Change in Unrecognized Pension and Postretirement Benefit Cost Tax Expense	70.6	61.7
Accumulated Other Comprehensive Income (Loss)at End of Year	(539.7)	(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	(17.2)	(10.7)
Net Actuarial Loss - Amortization	0.5	0
Net Actuarial Loss - Curtailment	0	0
Net Actuarial Loss - All Other Changes	(13.4)	(8.7)
Prior Service Credit - Amortization	0	0	0
Prior Service Credit - Plan Amendment	0	0
Change in Unrecognized Pension and Postretirement Benefit Cost Tax Expense	3.1	2.2
Accumulated Other Comprehensive Income (Loss)at End of Year	(27.0)	(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	10.7	15.3
Net Actuarial Loss - Amortization	0	0
Net Actuarial Loss - Curtailment	4.2	0
Net Actuarial Loss - All Other Changes	(19.4)	(5.5)
Prior Service Credit - Amortization	(2.6)	(2.6)	(2.6)
Prior Service Credit - Plan Amendment	5.0	0
Change in Unrecognized Pension and Postretirement Benefit Cost Tax Expense	(5.7)	3.5
Accumulated Other Comprehensive Income (Loss)at End of Year	$ (7.8)	$ 10.7	$ 15.3