Income Taxes - Reconciliation Between Provision for Income Taxes at Statutory Rate and Provision for Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Reconciliation [Line Items]
Tax expense at United States statutory rate	$ 227.8	$ 195.9	$ 133.0
Increase (decrease) in tax resulting from:
Differences between U.S. and foreign tax rates on foreign income, including withholding taxes	(68.7)	(134.1)	(77.8)
U.S. tax (benefit) on foreign income net of foreign tax credits	1.8	(8.8)	(19.3)
Increase (decrease) in valuation allowances	0.4	86.0	64.6
State taxes, net of federal benefit	7.6	5.5	5.9
Unrecognized tax benefits	6.6	1.1	(10.9)
Venezuela DASTM hyperinflationary impact			(14.5)
Other	(1.8)	1.6	(0.1)
Total	$ 173.7	$ 147.2	$ 80.9