Income Taxes - Components of Deferred Tax Assets (Liabilities) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Components Of Deferred Tax Assets And Liabilities [Line Items]
Settlement agreement and related accrued interest	$ 442.3	$ 383.8
Restructuring reserves	8.7	10.8
Accruals not yet deductible for tax purposes	74.1	67.5
Net operating loss carry forwards	132.6	124.5
Foreign, federal and state credits and investment tax allowances	53.2	130.2
Employee benefit items	129.7	125.9
Other	13.2	0.3
Gross deferred tax assets	853.8	843.0
Valuation allowance	(200.0)	(219.1)
Total deferred tax assets	653.8	623.9
Depreciation and amortization	(68.1)	(72.3)
Unremitted foreign earnings	(135.2)	(149.8)
Intangibles	(274.5)	(573.3)
Other	(10.0)	(15.7)
Total deferred tax liabilities	(487.8)	(811.1)
Net deferred tax assets (liabilities)	$ 166.0	$ (187.2)