Amounts Recognized In Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Total	$ 285.1	$ 485.9	$ (68.6)
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Amortization of Net actuarial (loss) gain	(32.1)
Amortization of Net prior service credit	(0.6)
Amounts arising during the period, Net actuarial loss	283.9
Amounts arising during the period, Net prior service credit	0.6
Amounts arising during the period, Foreign currency gain	2.8
Total	254.6
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Amortization of Net actuarial (loss) gain	0.1
Amortization of Net prior service credit	19.7
Amounts arising during the period, Net actuarial loss	10.5
Amounts arising during the period, Foreign currency gain	0.2
Total	$ 30.5