Fair Value Measurements of Assets and Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value Measurements Disclosure [Line Items]
Implied fair value, Goodwill			$ 41.0us-gaap_GoodwillFairValueDisclosure
Non-cash Goodwill impairment charges	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	96.0us-gaap_GoodwillImpairmentLoss
Annual impairment test goodwill balance	2,887.2us-gaap_GoodwillGross	2,984.2us-gaap_GoodwillGross	2,944.8us-gaap_GoodwillGross
Impairment charges in Special items related to indefinite lived intangible assets	14.2	2.8	11.6
U.S. Spine Reporting Unit [Member]
Fair Value Measurements Disclosure [Line Items]
Implied fair value, Goodwill			41.0
Reporting unit, percentage of fair value in excess of carrying amount	24.00%
US Dental Reporting Unit [Member]
Fair Value Measurements Disclosure [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount	24.00%	11.00%
Annual impairment test goodwill balance	$ 169.1

Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Name Accounting Standards Codification

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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