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Business Combinations and Asset Acquisitions - Summary of Company's Acquisition Activity (Details) € in Millions, $ in Millions | Dec. 01, 2021 USD ($) | Nov. 01, 2021 USD ($) | Sep. 01, 2021 USD ($) | Dec. 18, 2020 USD ($) | Dec. 01, 2020 USD ($) | Sep. 01, 2020 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 EUR (€) | Oct. 31, 2019 USD ($) | Oct. 31, 2019 EUR (€) | Jul. 19, 2019 USD ($) | Jul. 19, 2019 EUR (€) | Jul. 09, 2019 USD ($) | Oct. 31, 2018 USD ($) | Oct. 31, 2018 EUR (€)
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CIRS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, acquired percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, value | $ 55.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Safeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, acquired percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, value | $ 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, consideration transferred, contingent consideration | $ 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, acquired percentage |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, assets acquired |  | $ 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Dosimetry Badge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, acquired percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, assets acquired |  |  | $ 1.8 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, earn out |  |  | $ 0.8 |  |  |  |  |  |  |  |  |  |  |  |
Sun Nuclear |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, acquired percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase consideration |  |  |  | $ 258.1 |  |  |  |  |  |  |  |  |  |  |
Dosimetrics |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, acquired percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase consideration |  |  |  |  | $ 3.0 |  |  |  |  |  |  |  |  |  |
Biodex |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, acquired percentage |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Business acquisition, purchase consideration |  |  |  |  |  | $ 26.9 |  |  |  |  |  |  |  |  |
AWST |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, acquired percentage |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |
Business acquisition, purchase consideration |  |  |  |  |  |  | $ 26.9 | € 24.5 |  |  |  |  |  |  |
Selmic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, acquired percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |
Business acquisition, purchase consideration |  |  |  |  |  |  |  |  | $ 10.2 | € 9.1 |  |  |  |  |
Premium Analyse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, acquired percentage |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Business acquisition, purchase consideration |  |  |  |  |  |  |  |  |  |  | $ 8.9 | € 7.9 |  |  |
Capintec |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, acquired percentage |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Business acquisition, purchase consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.5 |  |
NRG Dosimetry Services Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, acquired percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00%
Business acquisition, purchase consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.1 | € 7.8

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