Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Line Items]
Undistributed earnings of foreign subsidiaries	$ 1,225.2
Valuation allowance	15.2	13.9
Uncertain tax positions	156.6	205.4	180.8	164.2
Uncertain tax positions if recognized would impact the effective tax rate	105.8
Expense on UTBs and other tax related liabilities	(0.4)	8.7	7.7
Accrued interest related to UTPs	10.6	41.5
UTPs
Income Tax Disclosure [Line Items]
Expense on UTBs and other tax related liabilities	$ 1.6