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Contingencies - Summary of Insurance Receivable Balances and Activity Related to Cumulative Trauma Product Liability Losses (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |
Balance beginning of period | $ 220.5us-gaap_InsuranceSettlementsReceivable | $ 124.8us-gaap_InsuranceSettlementsReceivable
Additions | 1.6us-gaap_LossContingencyRelatedReceivableCarryingValueAdditions | 98.2us-gaap_LossContingencyRelatedReceivableCarryingValueAdditions
Collections and settlements | 0us-gaap_LossContingencyRelatedReceivableCarryingValueReceipts | (2.5)us-gaap_LossContingencyRelatedReceivableCarryingValueReceipts
Balance end of period | $ 222.1us-gaap_InsuranceSettlementsReceivable | $ 220.5us-gaap_InsuranceSettlementsReceivable

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- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
Name: | us-gaap_InsuranceSettlementsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of additions to receivables pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12053-110248 + Details
Name: | us-gaap_LossContingencyRelatedReceivableCarryingValueAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of collections of receivables pertaining to a loss contingency. + References No definition available. + Details
Name: | us-gaap_LossContingencyRelatedReceivableCarryingValueReceipts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_MovementInLossContingencyRelatedReceivableIncreaseDecreaseRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration