Income Tax - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Line Items]
Non cash benefit due to release of deferred tax valuation allowance	$ 15.8	$ 16.9	$ 260.6
Deferred tax valuation allowance	(49.4)	7.0
Tax loss carryforwards	501.4
Tax carryforwards losses expired on 2013	14.7
Tax carryforwards losses expired on 2014	8.6
Tax carryforwards losses expired on 2015	3.4
Tax carryforwards losses expired on 2016 and beyond	369.3
Tax losses carryforwards unlimited years	105.4
Increase in accrued interest and penalties	0.6	1.0
Unrecognized Tax Benefits - Ending Balance	49.9	46.0	44.1
Accrued interest and penalties	13.5	12.7
Unrecognized tax benefit various tax position	1.6
Unrecognized tax benefit various tax position	1.6
Undistributed Earnings of Foreign Subsidiaries	74.5
Payments from Affiliate Under Tax Sharing Agreement Related to Prior Year	0.3	0
Payments from Affiliate Under Tax Sharing Agreement Related to Current Year	1.8	0.6
Payments from Affiliate Under Tax Sharing Agreement Expected in Following Year	0.1
Foreign [Member]
Income Tax Disclosure [Line Items]
Tax loss carryforwards	204.8
Domestic [Member]
Income Tax Disclosure [Line Items]
Tax loss carryforwards	$ 296.6