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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
	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

X

- 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

X

- 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

X

- 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

X

- Details

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