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Commitments and Contingencies - Product Liability (Details) - Product liability - Bair Hugger | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 USD ($) case item | Dec. 31, 2017 item
Product Liability Litigation |  |
Number of plaintiffs | 4,955 | 4,270
Accrued loss contingency reserve | $ | $ 0 |
Number of total claims dismissed | case | 61 |
U.S. District Court for the Western District of Tennessee |  |
Product Liability Litigation |  |
Number of lawsuits filed | 1 |

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