Amounts Recognized in Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Total	$ (919.0)	$ 285.1	$ 485.9
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Amortization of Net actuarial loss	50.5
Amounts arising during the period, Net actuarial gain	820.7
Amounts arising during the period, Net prior service credit
Amounts arising during the period, Settlements	0.7
Foreign currency loss	(0.5)
Total	871.4
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Amortization of Net actuarial loss
Amortization of Net prior service credit	(19.7)
Amounts arising during the period, Net actuarial gain	37.4
Amounts arising during the period, Net prior service credit	30.1
Foreign currency loss	(0.2)
Total	$ 47.6