Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Line Items]
Non cash benefit due to release of deferred tax valuation allowance	$ 15.8		$ 15.8	$ 16.9
Increase (decrease) in deferred tax valuation allowance		(8.9)	(49.4)
Tax loss carryforwards		563.3
Tax carryforwards losses expiration in 2014		1.1
Tax carryforwards losses expiration in 2015		0.4
Tax carryforwards losses expiration in 2016		2.1
Tax carryforwards losses expiration in 2017 and beyond		426.4
Tax losses carryforwards unlimited years		133.3
Increase (decrease) in accrued interest and penalties		(1.7)	0.6
Unrecognized tax benefits	49.9	74.5	49.9	46.0
Accrued interest and penalties	13.5	11.6	13.5
Reasonably possible increase (decrease) in unrecognized tax benefits		(4.0)
Undistributed Earnings of Foreign Subsidiaries		59.7
Payments from Affiliate Under Tax Sharing Agreement Related to Prior Year		0	0.3
Payments from Affiliate Under Tax Sharing Agreement Related to Current Year		1.3	1.8
Payments from Affiliate Under Tax Sharing Agreement Expected in Following Year		0
Foreign
Income Tax Disclosure [Line Items]
Tax loss carryforwards		286.0
Domestic
Income Tax Disclosure [Line Items]
Tax loss carryforwards		$ 277.3