Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	87 Months Ended	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Dec. 31, 2014	Mar. 01, 2013	Jun. 10, 2011
Loss Contingencies [Line Items]
Certain claims related expense	$ 0
Self-insured retention amount	20.00%
Receivables in other assets	170.3	170.3
Compensatory damages awarded	27.6
Percentage of fault apportioned to plaintiffs	30.00%
Percentage of fault apportioned to company	34.00%
Percentage of fault apportioned to unrelated third party	36.00%
Verdict in full and entered judgment					20.3
Compensatory damages vacated				27.6
Durom Cup Related Claims [Member]
Loss Contingencies [Line Items]
Certain claims related expense	0	471.7
Estimated liability outstanding	348.3	348.3
Estimated liability classified as short-term	50.0	50.0
Estimated liability classified as long-term	298.3	298.3
Stryker Corporation [Member]
Loss Contingencies [Line Items]
Number of patents infringed	3	3
Monetary damages for lost profits	70.0
Estimated charges			$ 70.0