Pension and Postretirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected cash contributions by the company in 2013	$ 144
Cash contributions	101.6	175.1	201.5
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Expected cash contributions by the company in 2013	34
International Plans
Defined Benefit Plan Disclosure [Line Items]
Expected cash contributions by the company in 2013	110
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Expected cash contributions by the company in 2013	20
Cash contributions	$ 11.0	$ 12.1	$ 20.4