Income Taxes - Components of Deferred Tax Assets (Liabilities) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Settlement agreement and related accrued interest		$ 460.7
Restructuring reserves	4.7	3.1
Accruals not yet deductible for tax purposes	56.5	68.3
Net operating loss carry forwards	291.1	127.0
Foreign, federal and state credits and investment tax allowances	109.3	32.7
Employee benefit items	163.8	130.6
Other	44.1us-gaap_DeferredTaxAssetsOther	20.2us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets	669.5us-gaap_DeferredTaxAssetsGross	842.6us-gaap_DeferredTaxAssetsGross
Valuation allowance	(227.8)	(240.0)
Total deferred tax assets	441.7us-gaap_DeferredTaxAssetsNet	602.6us-gaap_DeferredTaxAssetsNet
Depreciation and amortization	(40.0)	(51.8)
Unremitted foreign earnings	(130.0)	(135.2)
Intangibles	(214.2)	(256.0)
Other	(12.3)us-gaap_DeferredTaxLiabilitiesOther	(21.5)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(396.5)us-gaap_DeferredTaxLiabilities	(464.5)us-gaap_DeferredTaxLiabilities
Net deferred tax assets	$ 45.2us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 138.1us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred tax assets accruals not yet deductible for tax purposes.

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Deferred tax assets settlement agreement and related accrued interest.

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Deferred tax liabilities depreciation and amortization.

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Foreign, federal and state credits and investment tax allowances deferred tax assets.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from restructuring reserve.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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