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Goodwill and Intangible Assets - Government Grants (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Finite-Lived Intangible Assets |  |
Gross carrying amount | $ 430.9 | $ 436.0
Government grants |  |
Finite-Lived Intangible Assets |  |
Gross carrying amount | 7.6 | 7.8
Government grants | Current |  |
Finite-Lived Intangible Assets |  |
Gross carrying amount | 0.5 | 0.5
Government grants | Long-term |  |
Finite-Lived Intangible Assets |  |
Gross carrying amount | $ 7.1 | $ 7.3

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