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Dispositions - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2020
Chevron | Disposed of by Sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain on disposal | $ 152.8 |  |
Masternaut |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairment loss on investment |  | $ 15.7 |
Cumulative impairment loss on investments |  |  | $ 136.3

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