Amounts Recognized on Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit cost (included in accrued liabilities)	$ (344.3)	$ (372.3)
Pension liabilities	(245.2)	(1,150.5)
Other postretirement benefits plan liabilities	(174.1)	(241.7)
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension cost (included in other noncurrent assets)	8.0	4.4
Accrued benefit cost (included in accrued liabilities)	(8.2)	(7.4)
Pension liabilities	(245.2)	(1,150.5)
Other postretirement benefits plan liabilities
Net liabilities recognized in the Consolidated Balance Sheets	(245.4)	(1,153.5)
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension cost (included in other noncurrent assets)
Accrued benefit cost (included in accrued liabilities)	(1.4)	(1.4)
Pension liabilities
Other postretirement benefits plan liabilities	(174.1)	(241.7)
Net liabilities recognized in the Consolidated Balance Sheets	$ (175.5)	$ (243.1)