Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013 LegalMatter	Dec. 31, 2012
Loss Contingencies [Line Items]
Number Of Lawsuits	2,000
Number Of Claims In Lawsuit	2,200
Liability For claims and contingencies	$ 254.7	$ 278.9
Liability reserve for insurance claims	119.6	131.0
Environmental Reserve	39.3	49.2
Outstanding Value Of Letters Of Credit	$ 484.0	$ 493.2
Compliance Settlement Period	3 years

The total amount of pending claims pertaining to a loss contingency accrual as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant