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Acquisitions - Business Acquisition Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 30, 2018
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Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 283,708 | $ 275,502 | $ 274,082 |
Sotera Health LLC's Nordion Medical Isotope Business |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable – trade |  |  |  | $ 7,732
Contracts in progress |  |  |  | 51
Inventories |  |  |  | 2,113
Other current assets |  |  |  | 97
Property, plant and equipment |  |  |  | 12,948
Goodwill |  |  |  | 62,495
Deferred Income Taxes |  |  |  | 3,006
Intangible assets |  |  |  | 139,257
Total assets acquired |  |  |  | 227,699
Accounts payable |  |  |  | 654
Accrued employee benefits |  |  |  | 579
Accrued liabilities – other |  |  |  | 1,665
Environmental liabilities |  |  |  | 2,062
Pension liability |  |  |  | 9,746
Total liabilities assumed |  |  |  | 14,706
Net assets acquired |  |  |  | 212,993
Amount of tax deductible goodwill |  |  |  | $ 53,693

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