Reconciliation of United States Federal Statutory Tax Rate to Effective Tax Rate on Income Before Provision for Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Statutory Federal Tax Rate [Line Items]
U.S. statutory tax rate	35.00%		35.00%	35.00%
State and local taxes, net of federal tax benefit	2.40%		2.70%	2.90%
Benefit of foreign operations	(6.10%)		(6.30%)	(9.70%)
Legacy tax items	(0.40%)		(0.20%)	(0.40%)
Other	0.80%			0.30%
Effective tax rate	31.70%		31.20%	28.10%
Income tax paid	$ 293.3	[1]	$ 191.4	$ 247.9

[1] Includes approximately $92 million in payments for tax audit settlements in the first quarter of 2012.