Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Maturity period for net operating loss carryovers	1 to 20 years
Valuation allowances for net operating loss carryovers	$ 17.3	$ 17.0
Maturity period for tax credit carryovers	1 to 10 years
Valuation allowances for certain tax credit carryovers	14.9	14.2
Valuation allowances for potential capital losses	2.7	6.1
Maturity period for net Capital loss carryovers	4 to 5 years
Valuation allowances for net Capital loss carryovers	7.8	4.0
Unremitted earnings of foreign subsidiaries	3,354
Unrecognized tax benefits income tax penalties and interest expense recognized	8.2	23.2	(12.1)
Recognized liability for interest and penalties	42.1	33.9	10.7
Unrecognized tax benefits lower range	0
Unrecognized tax benefits upper range	$ 60
Examination period for state income tax returns	3 to 5 years
Foreign jurisdictions statutes of limitation period	3 to 5 years
State Examination Period After Notification	Up to 1 year